diff --git a/src/codec/SkJpegCodec.cpp b/src/codec/SkJpegCodec.cpp
index d44258f..fd95590 100644
--- a/src/codec/SkJpegCodec.cpp
+++ b/src/codec/SkJpegCodec.cpp
@@ -14,6 +14,7 @@
 #include "SkJpegInfo.h"
 #include "SkStream.h"
 #include "SkTemplates.h"
+#include "SkTo.h"
 #include "SkTypes.h"
 
 // stdio is needed for libjpeg-turbo
diff --git a/src/codec/SkWbmpCodec.cpp b/src/codec/SkWbmpCodec.cpp
index b5fd591..8d4beb1 100644
--- a/src/codec/SkWbmpCodec.cpp
+++ b/src/codec/SkWbmpCodec.cpp
@@ -5,13 +5,15 @@
  * found in the LICENSE file.
  */
 
+#include "SkWbmpCodec.h"
+
 #include "SkCodec.h"
 #include "SkCodecPriv.h"
 #include "SkColorData.h"
 #include "SkColorTable.h"
 #include "SkData.h"
 #include "SkStream.h"
-#include "SkWbmpCodec.h"
+#include "SkTo.h"
 
 // Each bit represents a pixel, so width is actually a number of bits.
 // A row will always be stored in bytes, so we round width up to the
diff --git a/src/codec/SkWebpCodec.cpp b/src/codec/SkWebpCodec.cpp
index 2f9420b..e26f46d 100644
--- a/src/codec/SkWebpCodec.cpp
+++ b/src/codec/SkWebpCodec.cpp
@@ -5,6 +5,9 @@
  * found in the LICENSE file.
  */
 
+#include "SkWebpCodec.h"
+
+#include "../jumper/SkJumper.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkCodecAnimation.h"
@@ -16,8 +19,7 @@
 #include "SkSampler.h"
 #include "SkStreamPriv.h"
 #include "SkTemplates.h"
-#include "SkWebpCodec.h"
-#include "../jumper/SkJumper.h"
+#include "SkTo.h"
 
 // A WebP decoder on top of (subset of) libwebp
 // For more information on WebP image format, and libwebp library, see:
diff --git a/src/core/SkAAClip.cpp b/src/core/SkAAClip.cpp
index fc8f771..46c09e0 100644
--- a/src/core/SkAAClip.cpp
+++ b/src/core/SkAAClip.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "SkAAClip.h"
+
 #include "SkAtomics.h"
 #include "SkBlitter.h"
 #include "SkColorData.h"
@@ -13,6 +14,7 @@
 #include "SkPath.h"
 #include "SkRectPriv.h"
 #include "SkScan.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 
 class AutoAAClipValidate {
diff --git a/src/core/SkAlphaRuns.cpp b/src/core/SkAlphaRuns.cpp
index 37f57c1..c5c4d15 100644
--- a/src/core/SkAlphaRuns.cpp
+++ b/src/core/SkAlphaRuns.cpp
@@ -5,8 +5,8 @@
  * found in the LICENSE file.
  */
 
-
 #include "SkAntiRun.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 
 void SkAlphaRuns::reset(int width) {
diff --git a/src/core/SkAnalyticEdge.cpp b/src/core/SkAnalyticEdge.cpp
index e2da090..60c956a 100644
--- a/src/core/SkAnalyticEdge.cpp
+++ b/src/core/SkAnalyticEdge.cpp
@@ -5,10 +5,11 @@
  * found in the LICENSE file.
  */
 
-
 #include "SkAnalyticEdge.h"
+
 #include "SkFDot6.h"
 #include "SkMathPriv.h"
+#include "SkTo.h"
 
 // This will become a bottleneck for small ovals rendering if we call SkFixedDiv twice here.
 // Therefore, we'll let the outter function compute the slope once and send in the value.
diff --git a/src/core/SkAnalyticEdge.h b/src/core/SkAnalyticEdge.h
index 5e8403f..b18ccac 100644
--- a/src/core/SkAnalyticEdge.h
+++ b/src/core/SkAnalyticEdge.h
@@ -9,6 +9,7 @@
 #define SkAnalyticEdge_DEFINED
 
 #include "SkEdge.h"
+#include "SkTo.h"
 
 struct SkAnalyticEdge {
     // Similar to SkEdge, the conic edges will be converted to quadratic edges
diff --git a/src/core/SkAntiRun.h b/src/core/SkAntiRun.h
index 8b19036..92aabff 100644
--- a/src/core/SkAntiRun.h
+++ b/src/core/SkAntiRun.h
@@ -5,11 +5,11 @@
  * found in the LICENSE file.
  */
 
-
 #ifndef SkAntiRun_DEFINED
 #define SkAntiRun_DEFINED
 
 #include "SkBlitter.h"
+#include "SkTo.h"
 
 /** Sparse array of run-length-encoded alpha (supersampling coverage) values.
     Sparseness allows us to independently compose several paths into the
diff --git a/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp
index 29a1a56..14bbe76 100644
--- a/src/core/SkBitmap.cpp
+++ b/src/core/SkBitmap.cpp
@@ -5,8 +5,9 @@
  * found in the LICENSE file.
  */
 
-#include "SkAtomics.h"
 #include "SkBitmap.h"
+
+#include "SkAtomics.h"
 #include "SkColorData.h"
 #include "SkConvertPixels.h"
 #include "SkData.h"
@@ -23,6 +24,7 @@
 #include "SkRect.h"
 #include "SkScalar.h"
 #include "SkTemplates.h"
+#include "SkTo.h"
 #include "SkUnPreMultiply.h"
 #include "SkWriteBuffer.h"
 #include "SkWritePixelsRec.h"
diff --git a/src/core/SkBitmapProcState_matrixProcs.cpp b/src/core/SkBitmapProcState_matrixProcs.cpp
index f9e3c82..2fd1b9b 100644
--- a/src/core/SkBitmapProcState_matrixProcs.cpp
+++ b/src/core/SkBitmapProcState_matrixProcs.cpp
@@ -14,10 +14,11 @@
  */
 
 #include "SkBitmapProcState.h"
+#include "SkBitmapProcState_utils.h"
 #include "SkShader.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 #include "SkUtilsArm.h"
-#include "SkBitmapProcState_utils.h"
 
 /*  returns 0...(n-1) given any x (positive or negative).
 
diff --git a/src/core/SkBitmapProcState_utils.h b/src/core/SkBitmapProcState_utils.h
index ec35ca1..b40b45c 100644
--- a/src/core/SkBitmapProcState_utils.h
+++ b/src/core/SkBitmapProcState_utils.h
@@ -8,6 +8,8 @@
 #ifndef SkBitmapProcState_utils_DEFINED
 #define SkBitmapProcState_utils_DEFINED
 
+#include "SkTo.h"
+
 // Helper to ensure that when we shift down, we do it w/o sign-extension
 // so the caller doesn't have to manually mask off the top 16 bits
 //
diff --git a/src/core/SkBlitter.cpp b/src/core/SkBlitter.cpp
index ee6100a..7a45981 100644
--- a/src/core/SkBlitter.cpp
+++ b/src/core/SkBlitter.cpp
@@ -5,21 +5,23 @@
  * found in the LICENSE file.
  */
 
-#include "SkArenaAlloc.h"
 #include "SkBlitter.h"
+
 #include "SkAntiRun.h"
+#include "SkArenaAlloc.h"
 #include "SkColor.h"
 #include "SkColorFilter.h"
-#include "SkReadBuffer.h"
-#include "SkWriteBuffer.h"
 #include "SkMask.h"
 #include "SkMaskFilterBase.h"
 #include "SkPaintPriv.h"
+#include "SkReadBuffer.h"
 #include "SkRegionPriv.h"
 #include "SkShaderBase.h"
 #include "SkString.h"
 #include "SkTLazy.h"
+#include "SkTo.h"
 #include "SkUtils.h"
+#include "SkWriteBuffer.h"
 #include "SkXfermodeInterpretation.h"
 
 SkBlitter::~SkBlitter() {}
diff --git a/src/core/SkBlitter.h b/src/core/SkBlitter.h
index cf3edd3..fc3bf8b 100644
--- a/src/core/SkBlitter.h
+++ b/src/core/SkBlitter.h
@@ -15,6 +15,7 @@
 #include "SkRect.h"
 #include "SkRegion.h"
 #include "SkShaderBase.h"
+#include "SkTo.h"
 
 class SkArenaAlloc;
 class SkMatrix;
diff --git a/src/core/SkBlurMask.cpp b/src/core/SkBlurMask.cpp
index 4b8293c..b36bc0c 100644
--- a/src/core/SkBlurMask.cpp
+++ b/src/core/SkBlurMask.cpp
@@ -5,15 +5,15 @@
  * found in the LICENSE file.
  */
 
-
 #include "SkBlurMask.h"
+
+#include "SkTo.h"
 #include "SkColorPriv.h"
 #include "SkMaskBlurFilter.h"
 #include "SkMath.h"
 #include "SkTemplates.h"
 #include "SkEndian.h"
 
-
 // This constant approximates the scaling done in the software path's
 // "high quality" mode, in SkBlurMask::Blur() (1 / sqrt(3)).
 // IMHO, it actually should be 1:  we blur "less" than we should do
diff --git a/src/core/SkBuffer.h b/src/core/SkBuffer.h
index 7dfe2bb..0338e76 100644
--- a/src/core/SkBuffer.h
+++ b/src/core/SkBuffer.h
@@ -5,10 +5,11 @@
  * found in the LICENSE file.
  */
 
-
 #ifndef SkBuffer_DEFINED
 #define SkBuffer_DEFINED
 
+#include <limits>
+
 #include "SkSafeMath.h"
 #include "SkScalar.h"
 #include "SkTypes.h"
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 8494bdb..494bd3b 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -5,53 +5,55 @@
  * found in the LICENSE file.
  */
 
+#include "SkCanvas.h"
+
 #include "SkArenaAlloc.h"
 #include "SkBitmapDevice.h"
-#include "SkCanvas.h"
 #include "SkCanvasPriv.h"
+#include "SkClipOpPriv.h"
 #include "SkClipStack.h"
 #include "SkColorFilter.h"
 #include "SkDraw.h"
-#include "SkDrawable.h"
 #include "SkDrawFilter.h"
 #include "SkDrawLooper.h"
+#include "SkDrawable.h"
 #include "SkGlyphCache.h"
 #include "SkGlyphRun.h"
 #include "SkImage.h"
-#include "SkImage_Base.h"
 #include "SkImageFilter.h"
 #include "SkImageFilterCache.h"
+#include "SkImage_Base.h"
 #include "SkLatticeIter.h"
+#include "SkMSAN.h"
 #include "SkMakeUnique.h"
 #include "SkMatrixUtils.h"
 #include "SkMetaData.h"
-#include "SkMSAN.h"
 #include "SkNoDrawCanvas.h"
 #include "SkNx.h"
 #include "SkPaintPriv.h"
 #include "SkPatchUtils.h"
 #include "SkPathEffect.h"
 #include "SkPicture.h"
+#include "SkRRect.h"
 #include "SkRasterClip.h"
 #include "SkRasterHandleAllocator.h"
-#include "SkRRect.h"
 #include "SkSpecialImage.h"
 #include "SkStrikeCache.h"
 #include "SkString.h"
 #include "SkSurface_Base.h"
+#include "SkTLazy.h"
 #include "SkTextBlob.h"
 #include "SkTextFormatParams.h"
-#include "SkTLazy.h"
+#include "SkTo.h"
 #include "SkTraceEvent.h"
+#include "SkVertices.h"
+
 #include <new>
 
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #include "SkGr.h"
-
 #endif
-#include "SkClipOpPriv.h"
-#include "SkVertices.h"
 
 #define RETURN_ON_NULL(ptr)     do { if (nullptr == (ptr)) return; } while (0)
 #define RETURN_ON_FALSE(pred)   do { if (!(pred)) return; } while (0)
diff --git a/src/core/SkColorData.h b/src/core/SkColorData.h
index 3fc0113..3e61c18 100644
--- a/src/core/SkColorData.h
+++ b/src/core/SkColorData.h
@@ -15,6 +15,7 @@
 
 #include "SkColor.h"
 #include "SkColorPriv.h"
+#include "SkTo.h"
 
 //////////////////////////////////////////////////////////////////////////////
 
diff --git a/src/core/SkDescriptor.h b/src/core/SkDescriptor.h
index 84672e5..7f1939d 100644
--- a/src/core/SkDescriptor.h
+++ b/src/core/SkDescriptor.h
@@ -10,7 +10,9 @@
 
 #include "SkMacros.h"
 #include "SkOpts.h"
+#include "SkTo.h"
 #include "SkTypes.h"
+
 #include <memory>
 #include <new>
 
diff --git a/src/core/SkDevice.cpp b/src/core/SkDevice.cpp
index aa9b1e2..aea08c5 100644
--- a/src/core/SkDevice.cpp
+++ b/src/core/SkDevice.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "SkDevice.h"
+
 #include "SkColorFilter.h"
 #include "SkDraw.h"
 #include "SkDrawFilter.h"
@@ -28,6 +29,7 @@
 #include "SkTLazy.h"
 #include "SkTextBlobRunIterator.h"
 #include "SkTextToPathIter.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 #include "SkVertices.h"
 
diff --git a/src/core/SkDraw.cpp b/src/core/SkDraw.cpp
index 69eadbe..58489b9 100644
--- a/src/core/SkDraw.cpp
+++ b/src/core/SkDraw.cpp
@@ -5,7 +5,7 @@
  * found in the LICENSE file.
  */
 
-#define __STDC_LIMIT_MACROS
+#include "SkDraw.h"
 
 #include "SkArenaAlloc.h"
 #include "SkAutoBlitterChoose.h"
@@ -14,7 +14,6 @@
 #include "SkCanvas.h"
 #include "SkColorData.h"
 #include "SkDevice.h"
-#include "SkDraw.h"
 #include "SkDrawProcs.h"
 #include "SkFindAndPlaceGlyph.h"
 #include "SkMaskFilterBase.h"
@@ -24,19 +23,20 @@
 #include "SkPaint.h"
 #include "SkPathEffect.h"
 #include "SkPathPriv.h"
+#include "SkRRect.h"
 #include "SkRasterClip.h"
 #include "SkRectPriv.h"
-#include "SkRRect.h"
 #include "SkScalerContext.h"
 #include "SkScan.h"
 #include "SkShader.h"
 #include "SkString.h"
 #include "SkStroke.h"
 #include "SkStrokeRec.h"
+#include "SkTLazy.h"
 #include "SkTemplates.h"
 #include "SkTextMapStateProc.h"
 #include "SkThreadedBMPDevice.h"
-#include "SkTLazy.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 
 static SkPaint make_paint_with_image(
diff --git a/src/core/SkEdge.cpp b/src/core/SkEdge.cpp
index 1bb8e9e..0a19e53 100644
--- a/src/core/SkEdge.cpp
+++ b/src/core/SkEdge.cpp
@@ -5,10 +5,11 @@
  * found in the LICENSE file.
  */
 
-
 #include "SkEdge.h"
+
 #include "SkFDot6.h"
 #include "SkMathPriv.h"
+#include "SkTo.h"
 
 /*
     In setLine, setQuadratic, setCubic, the first thing we do is to convert
diff --git a/src/core/SkEdge.h b/src/core/SkEdge.h
index 509c0c4..7fc6851 100644
--- a/src/core/SkEdge.h
+++ b/src/core/SkEdge.h
@@ -5,13 +5,13 @@
  * found in the LICENSE file.
  */
 
-
 #ifndef SkEdge_DEFINED
 #define SkEdge_DEFINED
 
-#include "SkRect.h"
 #include "SkFDot6.h"
 #include "SkMath.h"
+#include "SkRect.h"
+#include "SkTo.h"
 
 // This correctly favors the lower-pixel when y0 is on a 1/2 pixel boundary
 #define SkEdge_Compute_DY(top, y0)  (SkLeftShift(top, 6) + 32 - (y0))
diff --git a/src/core/SkEdgeBuilder.cpp b/src/core/SkEdgeBuilder.cpp
index b7d80b0..48c1bca 100644
--- a/src/core/SkEdgeBuilder.cpp
+++ b/src/core/SkEdgeBuilder.cpp
@@ -4,14 +4,17 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
 #include "SkEdgeBuilder.h"
-#include "SkEdge.h"
+
 #include "SkAnalyticEdge.h"
+#include "SkEdge.h"
 #include "SkEdgeClipper.h"
-#include "SkLineClipper.h"
 #include "SkGeometry.h"
+#include "SkLineClipper.h"
 #include "SkPath.h"
 #include "SkPathPriv.h"
+#include "SkTo.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/src/core/SkFDot6.h b/src/core/SkFDot6.h
index 0046661..57e7d6a 100644
--- a/src/core/SkFDot6.h
+++ b/src/core/SkFDot6.h
@@ -5,13 +5,13 @@
  * found in the LICENSE file.
  */
 
-
 #ifndef SkFDot6_DEFINED
 #define SkFDot6_DEFINED
 
 #include "SkFixed.h"
-#include "SkScalar.h"
 #include "SkMath.h"
+#include "SkScalar.h"
+#include "SkTo.h"
 
 typedef int32_t SkFDot6;
 
diff --git a/src/core/SkFont.cpp b/src/core/SkFont.cpp
index 77259ff..bde8c4c 100644
--- a/src/core/SkFont.cpp
+++ b/src/core/SkFont.cpp
@@ -6,6 +6,8 @@
  */
 
 #include "SkFont.h"
+
+#include "SkTo.h"
 #include "SkTypeface.h"
 #include "SkUtils.h"
 
diff --git a/src/core/SkGlyph.h b/src/core/SkGlyph.h
index 3ea795b..f618a33 100644
--- a/src/core/SkGlyph.h
+++ b/src/core/SkGlyph.h
@@ -12,6 +12,7 @@
 #include "SkChecksum.h"
 #include "SkFixed.h"
 #include "SkMask.h"
+#include "SkTo.h"
 #include "SkTypes.h"
 
 class SkPath;
diff --git a/src/core/SkGlyphRun.cpp b/src/core/SkGlyphRun.cpp
index 6209b58..caea07a 100644
--- a/src/core/SkGlyphRun.cpp
+++ b/src/core/SkGlyphRun.cpp
@@ -14,11 +14,12 @@
 #include "SkDevice.h"
 #include "SkDraw.h"
 #include "SkGlyphCache.h"
-#include "SkMakeUnique.h"
 #include "SkMSAN.h"
+#include "SkMakeUnique.h"
 #include "SkPaint.h"
 #include "SkPaintPriv.h"
 #include "SkStrikeCache.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 
 static SkTypeface::Encoding convert_encoding(SkPaint::TextEncoding encoding) {
diff --git a/src/core/SkIPoint16.h b/src/core/SkIPoint16.h
index 27052b3..735f167 100644
--- a/src/core/SkIPoint16.h
+++ b/src/core/SkIPoint16.h
@@ -8,6 +8,7 @@
 #ifndef SkIPoint16_DEFINED
 #define SkIPoint16_DEFINED
 
+#include "SkTo.h"
 #include "SkTypes.h"
 
 /** \struct SkIPoint16
diff --git a/src/core/SkLineClipper.cpp b/src/core/SkLineClipper.cpp
index 62da6d0..73a1819 100644
--- a/src/core/SkLineClipper.cpp
+++ b/src/core/SkLineClipper.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "SkLineClipper.h"
+#include "SkTo.h"
 
 template <typename T> T pin_unsorted(T value, T limit0, T limit1) {
     if (limit1 < limit0) {
diff --git a/src/core/SkMD5.h b/src/core/SkMD5.h
index 8838d47..5ae14e1 100644
--- a/src/core/SkMD5.h
+++ b/src/core/SkMD5.h
@@ -9,6 +9,7 @@
 #define SkMD5_DEFINED
 
 #include "SkStream.h"
+#include "SkTo.h"
 
 /* Calculate a 128-bit MD5 message-digest of the bytes sent to this stream. */
 class SkMD5 : public SkWStream {
diff --git a/src/core/SkMask.cpp b/src/core/SkMask.cpp
index b3a6543..7336116 100644
--- a/src/core/SkMask.cpp
+++ b/src/core/SkMask.cpp
@@ -6,8 +6,10 @@
  */
 
 #include "SkMask.h"
+
 #include "SkMalloc.h"
 #include "SkSafeMath.h"
+#include "SkTo.h"
 
 /** returns the product if it is positive and fits in 31 bits. Otherwise this
     returns 0.
diff --git a/src/core/SkMaskBlurFilter.cpp b/src/core/SkMaskBlurFilter.cpp
index ea3d8ab..2c8cda5 100644
--- a/src/core/SkMaskBlurFilter.cpp
+++ b/src/core/SkMaskBlurFilter.cpp
@@ -5,13 +5,15 @@
  * found in the LICENSE file.
  */
 
+#include "SkMaskBlurFilter.h"
+
 #include "SkArenaAlloc.h"
 #include "SkColorPriv.h"
 #include "SkGaussFilter.h"
 #include "SkMalloc.h"
-#include "SkMaskBlurFilter.h"
 #include "SkNx.h"
 #include "SkTemplates.h"
+#include "SkTo.h"
 
 #include <cmath>
 #include <climits>
diff --git a/src/core/SkMaskGamma.cpp b/src/core/SkMaskGamma.cpp
index bbe72c4..e231d92 100644
--- a/src/core/SkMaskGamma.cpp
+++ b/src/core/SkMaskGamma.cpp
@@ -5,11 +5,12 @@
  * found in the LICENSE file.
  */
 
-#include "SkTypes.h"
+#include "SkMaskGamma.h"
 
 #include "SkColor.h"
 #include "SkFloatingPoint.h"
-#include "SkMaskGamma.h"
+#include "SkTo.h"
+#include "SkTypes.h"
 
 class SkLinearColorSpaceLuminance : public SkColorSpaceLuminance {
     SkScalar toLuma(SkScalar SkDEBUGCODE(gamma), SkScalar luminance) const override {
diff --git a/src/core/SkMatrix.cpp b/src/core/SkMatrix.cpp
index d3bdb38..cb4b792 100644
--- a/src/core/SkMatrix.cpp
+++ b/src/core/SkMatrix.cpp
@@ -5,6 +5,8 @@
  * found in the LICENSE file.
  */
 
+#include "SkMatrix.h"
+
 #include "SkFloatBits.h"
 #include "SkMathPriv.h"
 #include "SkMatrixPriv.h"
@@ -13,6 +15,7 @@
 #include "SkPoint3.h"
 #include "SkRSXform.h"
 #include "SkString.h"
+#include "SkTo.h"
 #include <stddef.h>
 
 static void normalize_perspective(SkScalar mat[9]) {
diff --git a/src/core/SkMetaData.cpp b/src/core/SkMetaData.cpp
index d1564e9..e960321 100644
--- a/src/core/SkMetaData.cpp
+++ b/src/core/SkMetaData.cpp
@@ -5,11 +5,11 @@
  * found in the LICENSE file.
  */
 
-
 #include "SkMetaData.h"
 
 #include "SkMalloc.h"
 #include "SkRefCnt.h"
+#include "SkTo.h"
 
 struct PtrPair {
     void*               fPtr;
diff --git a/src/core/SkMipMap.cpp b/src/core/SkMipMap.cpp
index edb800f..f569682 100644
--- a/src/core/SkMipMap.cpp
+++ b/src/core/SkMipMap.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "SkMipMap.h"
+
 #include "SkBitmap.h"
 #include "SkColorData.h"
 #include "SkHalf.h"
@@ -14,6 +15,7 @@
 #include "SkNx.h"
 #include "SkPM4fPriv.h"
 #include "SkSRGB.h"
+#include "SkTo.h"
 #include "SkTypes.h"
 #include <new>
 
diff --git a/src/core/SkNx.h b/src/core/SkNx.h
index 9536540..1636dde 100644
--- a/src/core/SkNx.h
+++ b/src/core/SkNx.h
@@ -11,6 +11,8 @@
 #include "SkSafe_math.h"
 #include "SkScalar.h"
 #include "SkTypes.h"
+
+#include <algorithm>
 #include <limits>
 #include <type_traits>
 
diff --git a/src/core/SkOverdrawCanvas.cpp b/src/core/SkOverdrawCanvas.cpp
index e5bf5a6..25bc7fb 100644
--- a/src/core/SkOverdrawCanvas.cpp
+++ b/src/core/SkOverdrawCanvas.cpp
@@ -5,13 +5,14 @@
  * found in the LICENSE file.
  */
 
+#include "SkOverdrawCanvas.h"
+
 #include "SkColorFilter.h"
-#include "SkDrawable.h"
 #include "SkDrawShadowInfo.h"
+#include "SkDrawable.h"
 #include "SkFindAndPlaceGlyph.h"
 #include "SkImagePriv.h"
 #include "SkLatticeIter.h"
-#include "SkOverdrawCanvas.h"
 #include "SkPatchUtils.h"
 #include "SkPath.h"
 #include "SkRRect.h"
@@ -19,6 +20,7 @@
 #include "SkStrikeCache.h"
 #include "SkTextBlob.h"
 #include "SkTextBlobRunIterator.h"
+#include "SkTo.h"
 
 namespace {
 class ProcessOneGlyphBounds {
diff --git a/src/core/SkPaint.cpp b/src/core/SkPaint.cpp
index c76b981..7643bab 100644
--- a/src/core/SkPaint.cpp
+++ b/src/core/SkPaint.cpp
@@ -6,22 +6,22 @@
  */
 
 #include "SkPaint.h"
-#include "SkPaintPriv.h"
+
 #include "SkColorFilter.h"
 #include "SkData.h"
 #include "SkDraw.h"
 #include "SkFontDescriptor.h"
-#include "SkGraphics.h"
 #include "SkGlyphCache.h"
+#include "SkGraphics.h"
 #include "SkImageFilter.h"
 #include "SkMaskFilter.h"
 #include "SkMaskGamma.h"
 #include "SkMutex.h"
-#include "SkReadBuffer.h"
-#include "SkWriteBuffer.h"
 #include "SkOpts.h"
 #include "SkPaintDefaults.h"
+#include "SkPaintPriv.h"
 #include "SkPathEffect.h"
+#include "SkReadBuffer.h"
 #include "SkSafeRange.h"
 #include "SkScalar.h"
 #include "SkScalerContext.h"
@@ -31,12 +31,14 @@
 #include "SkStroke.h"
 #include "SkStrokeRec.h"
 #include "SkSurfacePriv.h"
+#include "SkTLazy.h"
 #include "SkTextBlob.h"
 #include "SkTextBlobRunIterator.h"
 #include "SkTextFormatParams.h"
 #include "SkTextToPathIter.h"
-#include "SkTLazy.h"
+#include "SkTo.h"
 #include "SkTypeface.h"
+#include "SkWriteBuffer.h"
 
 static inline uint32_t set_clear_mask(uint32_t bits, bool cond, uint32_t mask) {
     return cond ? bits | mask : bits & ~mask;
diff --git a/src/core/SkPath.cpp b/src/core/SkPath.cpp
index d80ceee..e38d736 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -5,7 +5,8 @@
  * found in the LICENSE file.
  */
 
-#include <cmath>
+#include "SkPath.h"
+
 #include "SkBuffer.h"
 #include "SkCubicClipper.h"
 #include "SkData.h"
@@ -18,6 +19,9 @@
 #include "SkPointPriv.h"
 #include "SkRRect.h"
 #include "SkSafeMath.h"
+#include "SkTo.h"
+
+#include <cmath>
 
 static float poly_eval(float A, float B, float C, float t) {
     return (A * t + B) * t + C;
diff --git a/src/core/SkPathRef.cpp b/src/core/SkPathRef.cpp
index 58782df..20d3131 100644
--- a/src/core/SkPathRef.cpp
+++ b/src/core/SkPathRef.cpp
@@ -5,13 +5,15 @@
  * found in the LICENSE file.
  */
 
+#include "SkPathRef.h"
+
 #include "SkBuffer.h"
 #include "SkNx.h"
 #include "SkOnce.h"
 #include "SkPath.h"
-#include "SkPathRef.h"
 #include "SkPathPriv.h"
 #include "SkSafeMath.h"
+#include "SkTo.h"
 
 // Conic weights must be 0 < weight <= finite
 static bool validate_conic_weights(const SkScalar weights[], int count) {
diff --git a/src/core/SkPath_serial.cpp b/src/core/SkPath_serial.cpp
index 3adcec2..d434dd1 100644
--- a/src/core/SkPath_serial.cpp
+++ b/src/core/SkPath_serial.cpp
@@ -5,7 +5,6 @@
  * found in the LICENSE file.
  */
 
-#include <cmath>
 #include "SkBuffer.h"
 #include "SkData.h"
 #include "SkMath.h"
@@ -13,6 +12,9 @@
 #include "SkPathRef.h"
 #include "SkRRectPriv.h"
 #include "SkSafeMath.h"
+#include "SkTo.h"
+
+#include <cmath>
 
 enum SerializationOffsets {
     kType_SerializationShift = 28,       // requires 4 bits
diff --git a/src/core/SkPicture.cpp b/src/core/SkPicture.cpp
index 34fa558..ad83031 100644
--- a/src/core/SkPicture.cpp
+++ b/src/core/SkPicture.cpp
@@ -5,6 +5,8 @@
  * found in the LICENSE file.
  */
 
+#include "SkPicture.h"
+
 #include "SkAtomics.h"
 #include "SkImageGenerator.h"
 #include "SkMathPriv.h"
@@ -15,6 +17,7 @@
 #include "SkPictureRecord.h"
 #include "SkPictureRecorder.h"
 #include "SkSerialProcs.h"
+#include "SkTo.h"
 
 // When we read/write the SkPictInfo via a stream, we have a sentinel byte right after the info.
 // Note: in the read/write buffer versions, we have a slightly different convention:
diff --git a/src/core/SkPictureData.cpp b/src/core/SkPictureData.cpp
index 3d34b27..bd2be63 100644
--- a/src/core/SkPictureData.cpp
+++ b/src/core/SkPictureData.cpp
@@ -5,18 +5,20 @@
  * found in the LICENSE file.
  */
 
-#include <new>
+#include "SkPictureData.h"
 
 #include "SkAutoMalloc.h"
 #include "SkImageGenerator.h"
 #include "SkMakeUnique.h"
-#include "SkPictureData.h"
 #include "SkPictureRecord.h"
 #include "SkPicturePriv.h"
 #include "SkReadBuffer.h"
 #include "SkTextBlob.h"
 #include "SkTypeface.h"
 #include "SkWriteBuffer.h"
+#include "SkTo.h"
+
+#include <new>
 
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
diff --git a/src/core/SkPictureRecord.cpp b/src/core/SkPictureRecord.cpp
index 32748c1..87c8c4d 100644
--- a/src/core/SkPictureRecord.cpp
+++ b/src/core/SkPictureRecord.cpp
@@ -6,7 +6,9 @@
  */
 
 #include "SkPictureRecord.h"
+
 #include "SkCanvasPriv.h"
+#include "SkClipOpPriv.h"
 #include "SkDrawShadowInfo.h"
 #include "SkImage_Base.h"
 #include "SkMatrixPriv.h"
@@ -14,9 +16,9 @@
 #include "SkPixelRef.h"
 #include "SkRRect.h"
 #include "SkRSXform.h"
-#include "SkTextBlob.h"
 #include "SkTSearch.h"
-#include "SkClipOpPriv.h"
+#include "SkTextBlob.h"
+#include "SkTo.h"
 
 #define HEAP_BLOCK_SIZE 4096
 
diff --git a/src/core/SkPictureRecord.h b/src/core/SkPictureRecord.h
index 9490f53..ad2dbdf 100644
--- a/src/core/SkPictureRecord.h
+++ b/src/core/SkPictureRecord.h
@@ -16,6 +16,7 @@
 #include "SkTArray.h"
 #include "SkTDArray.h"
 #include "SkTHash.h"
+#include "SkTo.h"
 #include "SkVertices.h"
 #include "SkWriter32.h"
 
diff --git a/src/core/SkPixmap.cpp b/src/core/SkPixmap.cpp
index 446f25b..aad9e34 100644
--- a/src/core/SkPixmap.cpp
+++ b/src/core/SkPixmap.cpp
@@ -5,14 +5,16 @@
  * found in the LICENSE file.
  */
 
+#include "SkPixmap.h"
+
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkColorData.h"
 #include "SkConvertPixels.h"
 #include "SkData.h"
+#include "SkHalf.h"
 #include "SkImageInfoPriv.h"
 #include "SkImageShader.h"
-#include "SkHalf.h"
 #include "SkMask.h"
 #include "SkNx.h"
 #include "SkPM4f.h"
@@ -20,6 +22,7 @@
 #include "SkReadPixelsRec.h"
 #include "SkSurface.h"
 #include "SkTemplates.h"
+#include "SkTo.h"
 #include "SkUnPreMultiply.h"
 #include "SkUtils.h"
 
diff --git a/src/core/SkRWBuffer.cpp b/src/core/SkRWBuffer.cpp
index ef33f91..69e4a2e 100644
--- a/src/core/SkRWBuffer.cpp
+++ b/src/core/SkRWBuffer.cpp
@@ -8,9 +8,10 @@
 #include "SkRWBuffer.h"
 
 #include "SkAtomics.h"
-#include "SkMalloc.h"
 #include "SkMakeUnique.h"
+#include "SkMalloc.h"
 #include "SkStream.h"
+#include "SkTo.h"
 
 #include <atomic>
 #include <new>
diff --git a/src/core/SkRasterPipelineBlitter.cpp b/src/core/SkRasterPipelineBlitter.cpp
index aa6b6e9..8b37bef 100644
--- a/src/core/SkRasterPipelineBlitter.cpp
+++ b/src/core/SkRasterPipelineBlitter.cpp
@@ -5,9 +5,10 @@
  * found in the LICENSE file.
  */
 
+#include "../jumper/SkJumper.h"
 #include "SkArenaAlloc.h"
-#include "SkBlitter.h"
 #include "SkBlendModePriv.h"
+#include "SkBlitter.h"
 #include "SkColor.h"
 #include "SkColorFilter.h"
 #include "SkColorSpaceXformer.h"
@@ -17,8 +18,8 @@
 #include "SkRasterPipeline.h"
 #include "SkShader.h"
 #include "SkShaderBase.h"
+#include "SkTo.h"
 #include "SkUtils.h"
-#include "../jumper/SkJumper.h"
 
 class SkRasterPipelineBlitter final : public SkBlitter {
 public:
diff --git a/src/core/SkRecorder.cpp b/src/core/SkRecorder.cpp
index 7d8a849..65dcd7b 100644
--- a/src/core/SkRecorder.cpp
+++ b/src/core/SkRecorder.cpp
@@ -5,13 +5,16 @@
  * found in the LICENSE file.
  */
 
+#include "SkRecorder.h"
+
 #include "SkBigPicture.h"
 #include "SkCanvasPriv.h"
 #include "SkImage.h"
 #include "SkPatchUtils.h"
 #include "SkPicture.h"
-#include "SkRecorder.h"
 #include "SkSurface.h"
+#include "SkTo.h"
+
 #include <new>
 
 SkDrawableList::~SkDrawableList() {
diff --git a/src/core/SkRegion.cpp b/src/core/SkRegion.cpp
index 1330067..3d48f36 100644
--- a/src/core/SkRegion.cpp
+++ b/src/core/SkRegion.cpp
@@ -5,12 +5,14 @@
  * found in the LICENSE file.
  */
 
+#include "SkRegion.h"
 
 #include "SkAtomics.h"
 #include "SkMacros.h"
 #include "SkRegionPriv.h"
 #include "SkSafeMath.h"
 #include "SkTemplates.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 
 /* Region Layout
diff --git a/src/core/SkRegionPriv.h b/src/core/SkRegionPriv.h
index 08db564..e0e46b2 100644
--- a/src/core/SkRegionPriv.h
+++ b/src/core/SkRegionPriv.h
@@ -5,7 +5,6 @@
  * found in the LICENSE file.
  */
 
-
 #ifndef SkRegionPriv_DEFINED
 #define SkRegionPriv_DEFINED
 
@@ -13,6 +12,7 @@
 
 #include "SkAtomics.h"
 #include "SkMalloc.h"
+#include "SkTo.h"
 
 inline bool SkRegionValueIsSentinel(int32_t value) {
     return value == (int32_t)SkRegion::kRunTypeSentinel;
diff --git a/src/core/SkRegion_path.cpp b/src/core/SkRegion_path.cpp
index 4fb6826..e54e251 100644
--- a/src/core/SkRegion_path.cpp
+++ b/src/core/SkRegion_path.cpp
@@ -5,13 +5,14 @@
  * found in the LICENSE file.
  */
 
-#include "SkRegionPriv.h"
 #include "SkBlitter.h"
+#include "SkPath.h"
+#include "SkRegionPriv.h"
 #include "SkSafeMath.h"
 #include "SkScan.h"
-#include "SkTSort.h"
 #include "SkTDArray.h"
-#include "SkPath.h"
+#include "SkTSort.h"
+#include "SkTo.h"
 
 // The rgnbuilder caller *seems* to pass short counts, possible often seens early failure, so
 // we may not want to promote this to a "std" routine just yet.
diff --git a/src/core/SkResourceCache.cpp b/src/core/SkResourceCache.cpp
index ee9d2d8..e016d23 100644
--- a/src/core/SkResourceCache.cpp
+++ b/src/core/SkResourceCache.cpp
@@ -5,12 +5,14 @@
  * found in the LICENSE file.
  */
 
+#include "SkResourceCache.h"
+
 #include "SkDiscardableMemory.h"
 #include "SkMessageBus.h"
 #include "SkMipMap.h"
 #include "SkMutex.h"
 #include "SkOpts.h"
-#include "SkResourceCache.h"
+#include "SkTo.h"
 #include "SkTraceMemoryDump.h"
 
 #include <stddef.h>
diff --git a/src/core/SkSafeMath.h b/src/core/SkSafeMath.h
index f54be32..c092272 100644
--- a/src/core/SkSafeMath.h
+++ b/src/core/SkSafeMath.h
@@ -8,6 +8,7 @@
 #ifndef SkSafeMath_DEFINED
 #define SkSafeMath_DEFINED
 
+#include "SkTFitsIn.h"
 #include "SkTypes.h"
 #include <limits>
 
diff --git a/src/core/SkScalerContext.cpp b/src/core/SkScalerContext.cpp
index b4a3565..3089ee9 100644
--- a/src/core/SkScalerContext.cpp
+++ b/src/core/SkScalerContext.cpp
@@ -29,6 +29,7 @@
 #include "SkStrokeRec.h"
 #include "SkSurfacePriv.h"
 #include "SkTextFormatParams.h"
+#include "SkTo.h"
 #include "SkWriteBuffer.h"
 #include <new>
 
diff --git a/src/core/SkScan_AAAPath.cpp b/src/core/SkScan_AAAPath.cpp
index 5e7f232..bd649e7 100644
--- a/src/core/SkScan_AAAPath.cpp
+++ b/src/core/SkScan_AAAPath.cpp
@@ -20,6 +20,7 @@
 #include "SkScanPriv.h"
 #include "SkTSort.h"
 #include "SkTemplates.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 
 ///////////////////////////////////////////////////////////////////////////////
diff --git a/src/core/SkScan_AntiPath.cpp b/src/core/SkScan_AntiPath.cpp
index 45bc2e2..9c64f32 100644
--- a/src/core/SkScan_AntiPath.cpp
+++ b/src/core/SkScan_AntiPath.cpp
@@ -5,15 +5,16 @@
  * found in the LICENSE file.
  */
 
-
 #include "SkScanPriv.h"
+
+#include "SkAntiRun.h"
+#include "SkBlitter.h"
+#include "SkCoverageDelta.h"
+#include "SkMatrix.h"
 #include "SkPath.h"
 #include "SkPathPriv.h"
-#include "SkMatrix.h"
-#include "SkBlitter.h"
 #include "SkRegion.h"
-#include "SkAntiRun.h"
-#include "SkCoverageDelta.h"
+#include "SkTo.h"
 
 #define SHIFT   SK_SUPERSAMPLE_SHIFT
 #define SCALE   (1 << SHIFT)
diff --git a/src/core/SkScan_Antihair.cpp b/src/core/SkScan_Antihair.cpp
index a552253..37faed4 100644
--- a/src/core/SkScan_Antihair.cpp
+++ b/src/core/SkScan_Antihair.cpp
@@ -5,13 +5,14 @@
  * found in the LICENSE file.
  */
 
-
 #include "SkScan.h"
+
 #include "SkBlitter.h"
 #include "SkColorData.h"
+#include "SkFDot6.h"
 #include "SkLineClipper.h"
 #include "SkRasterClip.h"
-#include "SkFDot6.h"
+#include "SkTo.h"
 
 /*  Our attempt to compute the worst case "bounds" for the horizontal and
     vertical cases has some numerical bug in it, and we sometimes undervalue
diff --git a/src/core/SkStream.cpp b/src/core/SkStream.cpp
index 57fd7f5..f8f4350 100644
--- a/src/core/SkStream.cpp
+++ b/src/core/SkStream.cpp
@@ -6,15 +6,17 @@
  */
 
 #include "SkStream.h"
-#include "SkStreamPriv.h"
+
 #include "SkData.h"
 #include "SkFixed.h"
 #include "SkMakeUnique.h"
-#include "SkSafeMath.h"
-#include "SkString.h"
 #include "SkOSFile.h"
-#include "SkTypes.h"
+#include "SkSafeMath.h"
+#include "SkStreamPriv.h"
+#include "SkString.h"
 #include "SkTFitsIn.h"
+#include "SkTo.h"
+#include "SkTypes.h"
 
 #include <limits>
 
diff --git a/src/core/SkString.cpp b/src/core/SkString.cpp
index a9c1d82..23c85f9 100644
--- a/src/core/SkString.cpp
+++ b/src/core/SkString.cpp
@@ -5,10 +5,13 @@
  * found in the LICENSE file.
  */
 
+#include "SkString.h"
+
 #include "SkAtomics.h"
 #include "SkSafeMath.h"
-#include "SkString.h"
+#include "SkTo.h"
 #include "SkUtils.h"
+
 #include <cstdio>
 #include <new>
 #include <stdarg.h>
diff --git a/src/core/SkStroke.cpp b/src/core/SkStroke.cpp
index 3452c77..bb216d1 100644
--- a/src/core/SkStroke.cpp
+++ b/src/core/SkStroke.cpp
@@ -6,10 +6,12 @@
  */
 
 #include "SkStrokerPriv.h"
+
 #include "SkGeometry.h"
 #include "SkMacros.h"
 #include "SkPathPriv.h"
 #include "SkPointPriv.h"
+#include "SkTo.h"
 
 enum {
     kTangent_RecursiveLimit,
diff --git a/src/core/SkStroke.h b/src/core/SkStroke.h
index b286572..189b5cf 100644
--- a/src/core/SkStroke.h
+++ b/src/core/SkStroke.h
@@ -8,10 +8,11 @@
 #ifndef SkStroke_DEFINED
 #define SkStroke_DEFINED
 
+#include "SkPaint.h"
 #include "SkPath.h"
 #include "SkPoint.h"
-#include "SkPaint.h"
 #include "SkStrokerPriv.h"
+#include "SkTo.h"
 
 #ifdef SK_DEBUG
 extern bool gDebugStrokerErrorSet;
diff --git a/src/core/SkTSort.h b/src/core/SkTSort.h
index e76f5c9..a97baf9 100644
--- a/src/core/SkTSort.h
+++ b/src/core/SkTSort.h
@@ -5,12 +5,12 @@
  * found in the LICENSE file.
  */
 
-
 #ifndef SkTSort_DEFINED
 #define SkTSort_DEFINED
 
-#include "SkTypes.h"
 #include "SkMathPriv.h"
+#include "SkTo.h"
+#include "SkTypes.h"
 
 /* A comparison functor which performs the comparison 'a < b'. */
 template <typename T> struct SkTCompareLT {
diff --git a/src/core/SkTime.cpp b/src/core/SkTime.cpp
index 7988925..b70b89c 100644
--- a/src/core/SkTime.cpp
+++ b/src/core/SkTime.cpp
@@ -5,10 +5,13 @@
  * found in the LICENSE file.
  */
 
+#include "SkTime.h"
+
 #include "SkLeanWindows.h"
 #include "SkString.h"
-#include "SkTime.h"
+#include "SkTo.h"
 #include "SkTypes.h"
+
 #include <chrono>
 
 void SkTime::DateTime::toISO8601(SkString* dst) const {
diff --git a/src/core/SkUtils.cpp b/src/core/SkUtils.cpp
index 0b92510..e6fafa0 100644
--- a/src/core/SkUtils.cpp
+++ b/src/core/SkUtils.cpp
@@ -5,9 +5,10 @@
  * found in the LICENSE file.
  */
 
-
 #include "SkUtils.h"
 
+#include "SkTo.h"
+
 /*  0xxxxxxx    1 total
     10xxxxxx    // never a leading byte
     110xxxxx    2 total
@@ -413,4 +414,4 @@
 const char SkHexadecimalDigits::gUpper[16] =
     { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
 const char SkHexadecimalDigits::gLower[16] =
-    { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
\ No newline at end of file
+    { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
diff --git a/src/core/SkVertices.cpp b/src/core/SkVertices.cpp
index c0f3eb2..e8bf1b7 100644
--- a/src/core/SkVertices.cpp
+++ b/src/core/SkVertices.cpp
@@ -5,12 +5,14 @@
  * found in the LICENSE file.
  */
 
-#include "SkAtomics.h"
 #include "SkVertices.h"
+
+#include "SkAtomics.h"
 #include "SkData.h"
 #include "SkReader32.h"
 #include "SkSafeMath.h"
 #include "SkSafeRange.h"
+#include "SkTo.h"
 #include "SkWriter32.h"
 #include <new>
 
diff --git a/src/core/SkWriteBuffer.cpp b/src/core/SkWriteBuffer.cpp
index b793dbf..a40e9ab 100644
--- a/src/core/SkWriteBuffer.cpp
+++ b/src/core/SkWriteBuffer.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "SkWriteBuffer.h"
+
 #include "SkBitmap.h"
 #include "SkData.h"
 #include "SkDeduper.h"
@@ -14,6 +15,7 @@
 #include "SkPixelRef.h"
 #include "SkPtrRecorder.h"
 #include "SkStream.h"
+#include "SkTo.h"
 #include "SkTypeface.h"
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
diff --git a/src/core/SkWriter32.cpp b/src/core/SkWriter32.cpp
index 3261aad..b1638e4 100644
--- a/src/core/SkWriter32.cpp
+++ b/src/core/SkWriter32.cpp
@@ -8,6 +8,8 @@
 #include "SkMatrixPriv.h"
 #include "SkReader32.h"
 #include "SkString.h"
+#include "SkTo.h"
+
 #include "SkWriter32.h"
 
 void SkWriter32::writeMatrix(const SkMatrix& matrix) {
diff --git a/src/core/SkWriter32.h b/src/core/SkWriter32.h
index 2143c6b..de33c5c 100644
--- a/src/core/SkWriter32.h
+++ b/src/core/SkWriter32.h
@@ -1,4 +1,3 @@
-
 /*
  * Copyright 2008 The Android Open Source Project
  *
@@ -6,11 +5,9 @@
  * found in the LICENSE file.
  */
 
-
 #ifndef SkWriter32_DEFINED
 #define SkWriter32_DEFINED
 
-#include "../private/SkTemplates.h"
 #include "SkData.h"
 #include "SkMatrix.h"
 #include "SkPath.h"
@@ -21,6 +18,8 @@
 #include "SkRegion.h"
 #include "SkScalar.h"
 #include "SkStream.h"
+#include "SkTemplates.h"
+#include "SkTo.h"
 #include "SkTypes.h"
 
 class SK_API SkWriter32 : SkNoncopyable {
diff --git a/src/effects/SkDashPathEffect.cpp b/src/effects/SkDashPathEffect.cpp
index c1f5f0a..8301592 100644
--- a/src/effects/SkDashPathEffect.cpp
+++ b/src/effects/SkDashPathEffect.cpp
@@ -6,12 +6,14 @@
  */
 
 #include "SkDashPathEffect.h"
+
 #include "SkDashImpl.h"
 #include "SkDashPathPriv.h"
 #include "SkFlattenablePriv.h"
 #include "SkReadBuffer.h"
-#include "SkWriteBuffer.h"
 #include "SkStrokeRec.h"
+#include "SkTo.h"
+#include "SkWriteBuffer.h"
 
 SkDashImpl::SkDashImpl(const SkScalar intervals[], int count, SkScalar phase)
         : fPhase(0)
diff --git a/src/effects/SkEmbossMask.cpp b/src/effects/SkEmbossMask.cpp
index e081186..d4e3741 100644
--- a/src/effects/SkEmbossMask.cpp
+++ b/src/effects/SkEmbossMask.cpp
@@ -5,10 +5,11 @@
  * found in the LICENSE file.
  */
 
-
 #include "SkEmbossMask.h"
+
 #include "SkFixed.h"
 #include "SkMath.h"
+#include "SkTo.h"
 
 static inline int nonzero_to_one(int x) {
 #if 0
diff --git a/src/effects/SkPackBits.cpp b/src/effects/SkPackBits.cpp
index d2dfed9..e465909 100644
--- a/src/effects/SkPackBits.cpp
+++ b/src/effects/SkPackBits.cpp
@@ -4,8 +4,11 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
 #include "SkPackBits.h"
 
+#include "SkTo.h"
+
 size_t SkPackBits::ComputeMaxSize8(size_t srcSize) {
     // worst case is the number of 8bit values + 1 byte per (up to) 128 entries.
     return ((srcSize + 127) >> 7) + srcSize;
diff --git a/src/effects/SkPaintFlagsDrawFilter.cpp b/src/effects/SkPaintFlagsDrawFilter.cpp
index dc1c007..12b8fbb 100644
--- a/src/effects/SkPaintFlagsDrawFilter.cpp
+++ b/src/effects/SkPaintFlagsDrawFilter.cpp
@@ -6,7 +6,9 @@
  */
 
 #include "SkPaintFlagsDrawFilter.h"
+
 #include "SkPaint.h"
+#include "SkTo.h"
 
 SkPaintFlagsDrawFilter::SkPaintFlagsDrawFilter(uint32_t clearFlags,
                                                uint32_t setFlags) {
diff --git a/src/effects/SkTableColorFilter.cpp b/src/effects/SkTableColorFilter.cpp
index 5dbc784..fa68d11 100644
--- a/src/effects/SkTableColorFilter.cpp
+++ b/src/effects/SkTableColorFilter.cpp
@@ -6,13 +6,15 @@
  */
 
 #include "SkTableColorFilter.h"
-#include "SkPM4f.h"
+
 #include "SkArenaAlloc.h"
 #include "SkBitmap.h"
 #include "SkColorData.h"
+#include "SkPM4f.h"
 #include "SkRasterPipeline.h"
 #include "SkReadBuffer.h"
 #include "SkString.h"
+#include "SkTo.h"
 #include "SkUnPreMultiply.h"
 #include "SkWriteBuffer.h"
 
diff --git a/src/gpu/GrClipStackClip.cpp b/src/gpu/GrClipStackClip.cpp
index 92a6d04..212aa36 100644
--- a/src/gpu/GrClipStackClip.cpp
+++ b/src/gpu/GrClipStackClip.cpp
@@ -13,18 +13,19 @@
 #include "GrDrawingManager.h"
 #include "GrFixedClip.h"
 #include "GrGpuResourcePriv.h"
-#include "GrRenderTargetContextPriv.h"
 #include "GrProxyProvider.h"
-#include "GrStencilAttachment.h"
+#include "GrRenderTargetContextPriv.h"
 #include "GrSWMaskHelper.h"
+#include "GrStencilAttachment.h"
 #include "GrTextureProxy.h"
-#include "effects/GrConvexPolyEffect.h"
-#include "effects/GrRRectEffect.h"
-#include "effects/GrTextureDomain.h"
 #include "SkClipOpPriv.h"
 #include "SkMakeUnique.h"
 #include "SkTaskGroup.h"
+#include "SkTo.h"
 #include "SkTraceEvent.h"
+#include "effects/GrConvexPolyEffect.h"
+#include "effects/GrRRectEffect.h"
+#include "effects/GrTextureDomain.h"
 
 typedef SkClipStack::Element Element;
 typedef GrReducedClip::InitialState InitialState;
diff --git a/src/gpu/GrPathProcessor.cpp b/src/gpu/GrPathProcessor.cpp
index 43c0bb0..0b4354c 100644
--- a/src/gpu/GrPathProcessor.cpp
+++ b/src/gpu/GrPathProcessor.cpp
@@ -6,7 +6,9 @@
 */
 
 #include "GrPathProcessor.h"
+
 #include "GrShaderCaps.h"
+#include "SkTo.h"
 #include "gl/GrGLGpu.h"
 #include "gl/GrGLVaryingHandler.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
diff --git a/src/gpu/GrProgramDesc.cpp b/src/gpu/GrProgramDesc.cpp
index 5b7e5e3..c552789 100644
--- a/src/gpu/GrProgramDesc.cpp
+++ b/src/gpu/GrProgramDesc.cpp
@@ -4,7 +4,9 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
 #include "GrProgramDesc.h"
+
 #include "GrPipeline.h"
 #include "GrPrimitiveProcessor.h"
 #include "GrProcessor.h"
@@ -12,6 +14,7 @@
 #include "GrShaderCaps.h"
 #include "GrTexturePriv.h"
 #include "SkChecksum.h"
+#include "SkTo.h"
 #include "glsl/GrGLSLFragmentProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 
diff --git a/src/gpu/GrProgramDesc.h b/src/gpu/GrProgramDesc.h
index 68fdcdb..f687876 100644
--- a/src/gpu/GrProgramDesc.h
+++ b/src/gpu/GrProgramDesc.h
@@ -12,6 +12,7 @@
 #include "GrTypesPriv.h"
 #include "SkOpts.h"
 #include "SkTArray.h"
+#include "SkTo.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 
 class GrShaderCaps;
diff --git a/src/gpu/GrRect.h b/src/gpu/GrRect.h
index 95102a8..8c44ed7 100644
--- a/src/gpu/GrRect.h
+++ b/src/gpu/GrRect.h
@@ -8,6 +8,7 @@
 #ifndef GrRect_DEFINED
 #define GrRect_DEFINED
 
+#include "SkTo.h"
 #include "SkTypes.h"
 #include "SkRect.h"
 
diff --git a/src/gpu/GrResourceCache.cpp b/src/gpu/GrResourceCache.cpp
index 8ed3594..4e69444 100644
--- a/src/gpu/GrResourceCache.cpp
+++ b/src/gpu/GrResourceCache.cpp
@@ -5,7 +5,6 @@
  * found in the LICENSE file.
  */
 
-
 #include "GrResourceCache.h"
 
 #include "GrCaps.h"
@@ -18,6 +17,7 @@
 #include "SkMessageBus.h"
 #include "SkOpts.h"
 #include "SkTSort.h"
+#include "SkTo.h"
 
 DECLARE_SKMESSAGEBUS_MESSAGE(GrUniqueKeyInvalidatedMessage);
 
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 210cefc..ee8026c 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "SkGpuDevice.h"
+
 #include "../private/SkShadowFlags.h"
 #include "GrBitmapTextureMaker.h"
 #include "GrBlurUtils.h"
@@ -43,6 +44,7 @@
 #include "SkSurface.h"
 #include "SkSurface_Gpu.h"
 #include "SkTLazy.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 #include "SkVertState.h"
 #include "SkVertices.h"
diff --git a/src/gpu/effects/GrPorterDuffXferProcessor.cpp b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
index c727670..ca08260 100644
--- a/src/gpu/effects/GrPorterDuffXferProcessor.cpp
+++ b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
@@ -14,6 +14,7 @@
 #include "GrProcessorAnalysis.h"
 #include "GrTypes.h"
 #include "GrXferProcessor.h"
+#include "SkTo.h"
 #include "glsl/GrGLSLBlend.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLProgramDataManager.h"
diff --git a/src/gpu/gl/GrGLCreateNullInterface.cpp b/src/gpu/gl/GrGLCreateNullInterface.cpp
index 9df2265..a14fc67 100644
--- a/src/gpu/gl/GrGLCreateNullInterface.cpp
+++ b/src/gpu/gl/GrGLCreateNullInterface.cpp
@@ -5,12 +5,13 @@
  * found in the LICENSE file.
  */
 
-
-#include "GrNonAtomicRef.h"
-#include "gl/GrGLInterface.h"
 #include "GrGLTestInterface.h"
+#include "GrNonAtomicRef.h"
 #include "SkMutex.h"
 #include "SkTDArray.h"
+#include "SkTo.h"
+#include "gl/GrGLInterface.h"
+
 #include <type_traits>
 
 // added to suppress 'no previous prototype' warning and because this code is duplicated in
diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index 2c7d977..88f5abe 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -7,7 +7,6 @@
 
 #include "GrGLGpu.h"
 
-#include <cmath>
 #include "../private/GrGLSL.h"
 #include "GrBackendSemaphore.h"
 #include "GrBackendSurface.h"
@@ -35,10 +34,13 @@
 #include "SkSLCompiler.h"
 #include "SkStrokeRec.h"
 #include "SkTemplates.h"
+#include "SkTo.h"
 #include "SkTraceEvent.h"
 #include "SkTypes.h"
 #include "builders/GrGLShaderStringBuilder.h"
 
+#include <cmath>
+
 #define GL_CALL(X) GR_GL_CALL(this->glInterface(), X)
 #define GL_CALL_RET(RET, X) GR_GL_CALL_RET(this->glInterface(), RET, X)
 
diff --git a/src/gpu/ops/GrOp.cpp b/src/gpu/ops/GrOp.cpp
index 798d29d..f020cde 100644
--- a/src/gpu/ops/GrOp.cpp
+++ b/src/gpu/ops/GrOp.cpp
@@ -9,6 +9,7 @@
 
 #include "GrMemoryPool.h"
 #include "SkSpinlock.h"
+#include "SkTo.h"
 
 // TODO I noticed a small benefit to using a larger exclusive pool for ops. Its very small, but
 // seems to be mostly consistent.  There is a lot in flux right now, but we should really revisit
diff --git a/src/gpu/ops/GrTextureOp.cpp b/src/gpu/ops/GrTextureOp.cpp
index 2301930..98228c5 100644
--- a/src/gpu/ops/GrTextureOp.cpp
+++ b/src/gpu/ops/GrTextureOp.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "GrTextureOp.h"
+
 #include "GrAppliedClip.h"
 #include "GrCaps.h"
 #include "GrContext.h"
@@ -26,6 +27,7 @@
 #include "SkMatrixPriv.h"
 #include "SkPoint.h"
 #include "SkPoint3.h"
+#include "SkTo.h"
 #include "glsl/GrGLSLColorSpaceXformHelper.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLGeometryProcessor.h"
diff --git a/src/gpu/text/GrTextContext.cpp b/src/gpu/text/GrTextContext.cpp
index 2fc1f5b..b63b726 100644
--- a/src/gpu/text/GrTextContext.cpp
+++ b/src/gpu/text/GrTextContext.cpp
@@ -4,7 +4,9 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
 #include "GrTextContext.h"
+
 #include "GrCaps.h"
 #include "GrContext.h"
 #include "GrContextPriv.h"
@@ -15,14 +17,14 @@
 #include "SkDrawFilter.h"
 #include "SkDrawProcs.h"
 #include "SkFindAndPlaceGlyph.h"
+#include "SkGlyphRun.h"
 #include "SkGr.h"
 #include "SkGraphics.h"
-#include "SkGlyphRun.h"
 #include "SkMakeUnique.h"
 #include "SkMaskFilterBase.h"
 #include "SkPaintPriv.h"
 #include "SkTextMapStateProc.h"
-
+#include "SkTo.h"
 #include "ops/GrMeshDrawOp.h"
 
 // DF sizes and thresholds for usage of the small and medium sizes. For example, above
diff --git a/src/gpu/vk/GrVkGpu.cpp b/src/gpu/vk/GrVkGpu.cpp
index 346d95b..d0eb876 100644
--- a/src/gpu/vk/GrVkGpu.cpp
+++ b/src/gpu/vk/GrVkGpu.cpp
@@ -16,7 +16,6 @@
 #include "GrPipeline.h"
 #include "GrRenderTargetPriv.h"
 #include "GrTexturePriv.h"
-
 #include "GrVkAMDMemoryAllocator.h"
 #include "GrVkCommandBuffer.h"
 #include "GrVkGpuCommandBuffer.h"
@@ -33,15 +32,13 @@
 #include "GrVkTextureRenderTarget.h"
 #include "GrVkTransferBuffer.h"
 #include "GrVkVertexBuffer.h"
-
 #include "SkConvertPixels.h"
 #include "SkMipMap.h"
-
+#include "SkSLCompiler.h"
+#include "SkTo.h"
 #include "vk/GrVkInterface.h"
 #include "vk/GrVkTypes.h"
 
-#include "SkSLCompiler.h"
-
 #if !defined(SK_BUILD_FOR_WIN)
 #include <unistd.h>
 #endif // !defined(SK_BUILD_FOR_WIN)
diff --git a/src/opts/SkBitmapProcState_matrixProcs_neon.cpp b/src/opts/SkBitmapProcState_matrixProcs_neon.cpp
index 1efd1ed..4f166fb 100644
--- a/src/opts/SkBitmapProcState_matrixProcs_neon.cpp
+++ b/src/opts/SkBitmapProcState_matrixProcs_neon.cpp
@@ -5,9 +5,10 @@
  */
 
 #include "SkBitmapProcState.h"
-#include "SkShader.h"
-#include "SkUtilsArm.h"
 #include "SkBitmapProcState_utils.h"
+#include "SkShader.h"
+#include "SkTo.h"
+#include "SkUtilsArm.h"
 
 #include <arm_neon.h>
 
diff --git a/src/opts/SkBitmapProcState_opts_SSE2.cpp b/src/opts/SkBitmapProcState_opts_SSE2.cpp
index efe8f4d..2484123 100644
--- a/src/opts/SkBitmapProcState_opts_SSE2.cpp
+++ b/src/opts/SkBitmapProcState_opts_SSE2.cpp
@@ -5,13 +5,15 @@
  * found in the LICENSE file.
  */
 
-#include <emmintrin.h>
 #include "SkBitmapProcState_opts_SSE2.h"
 #include "SkBitmapProcState_utils.h"
 #include "SkColorData.h"
 #include "SkPaint.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 
+#include <emmintrin.h>
+
 void S32_opaque_D32_filter_DX_SSE2(const SkBitmapProcState& s,
                                    const uint32_t* xy,
                                    int count, uint32_t* colors) {
diff --git a/src/pdf/SkClusterator.cpp b/src/pdf/SkClusterator.cpp
index 3d6800b..6c56eb6 100644
--- a/src/pdf/SkClusterator.cpp
+++ b/src/pdf/SkClusterator.cpp
@@ -7,6 +7,7 @@
 
 #include "SkClusterator.h"
 
+#include "SkTo.h"
 #include "SkUtils.h"
 
 static bool is_reversed(const uint32_t* clusters, uint32_t count) {
diff --git a/src/pdf/SkDeflate.cpp b/src/pdf/SkDeflate.cpp
index 6952ec4..be3e182 100644
--- a/src/pdf/SkDeflate.cpp
+++ b/src/pdf/SkDeflate.cpp
@@ -5,11 +5,12 @@
  * found in the LICENSE file.
  */
 
+#include "SkDeflate.h"
 
 #include "SkData.h"
-#include "SkDeflate.h"
 #include "SkMakeUnique.h"
 #include "SkMalloc.h"
+#include "SkTo.h"
 #include "SkTraceEvent.h"
 
 #include "zlib.h"
diff --git a/src/pdf/SkJpegInfo.cpp b/src/pdf/SkJpegInfo.cpp
index df99de4..72e659e 100644
--- a/src/pdf/SkJpegInfo.cpp
+++ b/src/pdf/SkJpegInfo.cpp
@@ -7,6 +7,8 @@
 
 #include "SkJpegInfo.h"
 
+#include "SkTo.h"
+
 #ifndef SK_HAS_JPEG_LIBRARY
 
 namespace {
diff --git a/src/pdf/SkPDFBitmap.cpp b/src/pdf/SkPDFBitmap.cpp
index 9d86d90..38e5327 100644
--- a/src/pdf/SkPDFBitmap.cpp
+++ b/src/pdf/SkPDFBitmap.cpp
@@ -16,6 +16,7 @@
 #include "SkPDFTypes.h"
 #include "SkPDFUtils.h"
 #include "SkStream.h"
+#include "SkTo.h"
 #include "SkUnPreMultiply.h"
 
 bool image_compute_is_opaque(const SkImage* image) {
diff --git a/src/pdf/SkPDFConvertType1FontStream.cpp b/src/pdf/SkPDFConvertType1FontStream.cpp
index 387f0ef..74e148c 100644
--- a/src/pdf/SkPDFConvertType1FontStream.cpp
+++ b/src/pdf/SkPDFConvertType1FontStream.cpp
@@ -6,7 +6,9 @@
  */
 
 #include "SkPDFConvertType1FontStream.h"
+
 #include "SkTemplates.h"
+#include "SkTo.h"
 
 #include <ctype.h>
 
diff --git a/src/pdf/SkPDFDevice.cpp b/src/pdf/SkPDFDevice.cpp
index f4c034e..4f214c1 100644
--- a/src/pdf/SkPDFDevice.cpp
+++ b/src/pdf/SkPDFDevice.cpp
@@ -45,6 +45,7 @@
 #include "SkTemplates.h"
 #include "SkTextBlobRunIterator.h"
 #include "SkTextFormatParams.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 #include "SkXfermodeInterpretation.h"
 
diff --git a/src/pdf/SkPDFDocument.cpp b/src/pdf/SkPDFDocument.cpp
index 8219ad3..577bac7 100644
--- a/src/pdf/SkPDFDocument.cpp
+++ b/src/pdf/SkPDFDocument.cpp
@@ -13,6 +13,7 @@
 #include "SkPDFDevice.h"
 #include "SkPDFUtils.h"
 #include "SkStream.h"
+#include "SkTo.h"
 
 SkPDFObjectSerializer::SkPDFObjectSerializer() : fBaseOffset(0), fNextToBeSerialized(0) {}
 
diff --git a/src/pdf/SkPDFFont.cpp b/src/pdf/SkPDFFont.cpp
index 2db8755..022e214 100644
--- a/src/pdf/SkPDFFont.cpp
+++ b/src/pdf/SkPDFFont.cpp
@@ -5,6 +5,8 @@
  * found in the LICENSE file.
  */
 
+#include "SkPDFFont.h"
+
 #include "SkData.h"
 #include "SkGlyphCache.h"
 #include "SkMacros.h"
@@ -12,7 +14,6 @@
 #include "SkPDFCanon.h"
 #include "SkPDFConvertType1FontStream.h"
 #include "SkPDFDevice.h"
-#include "SkPDFFont.h"
 #include "SkPDFMakeCIDGlyphWidthsArray.h"
 #include "SkPDFMakeToUnicodeCmap.h"
 #include "SkPDFUtils.h"
@@ -20,6 +21,7 @@
 #include "SkRefCnt.h"
 #include "SkScalar.h"
 #include "SkStream.h"
+#include "SkTo.h"
 #include "SkTypes.h"
 #include "SkUtils.h"
 
diff --git a/src/pdf/SkPDFGraphicState.cpp b/src/pdf/SkPDFGraphicState.cpp
index cab071c..b44c114 100644
--- a/src/pdf/SkPDFGraphicState.cpp
+++ b/src/pdf/SkPDFGraphicState.cpp
@@ -5,12 +5,14 @@
  * found in the LICENSE file.
  */
 
+#include "SkPDFGraphicState.h"
+
 #include "SkData.h"
-#include "SkPaint.h"
 #include "SkPDFCanon.h"
 #include "SkPDFFormXObject.h"
-#include "SkPDFGraphicState.h"
 #include "SkPDFUtils.h"
+#include "SkPaint.h"
+#include "SkTo.h"
 
 static const char* as_pdf_blend_mode_name(SkBlendMode mode) {
     // PDF32000.book section 11.3.5 "Blend Mode"
diff --git a/src/pdf/SkPDFMakeCIDGlyphWidthsArray.cpp b/src/pdf/SkPDFMakeCIDGlyphWidthsArray.cpp
index 4d5471d..62902c1 100644
--- a/src/pdf/SkPDFMakeCIDGlyphWidthsArray.cpp
+++ b/src/pdf/SkPDFMakeCIDGlyphWidthsArray.cpp
@@ -5,10 +5,12 @@
  * found in the LICENSE file.
  */
 
-#include "SkBitSet.h"
 #include "SkPDFMakeCIDGlyphWidthsArray.h"
-#include "SkPaint.h"
+
+#include "SkBitSet.h"
 #include "SkGlyphCache.h"
+#include "SkPaint.h"
+#include "SkTo.h"
 
 // TODO(halcanary): Write unit tests for SkPDFMakeCIDGlyphWidthsArray().
 
diff --git a/src/pdf/SkPDFMakeToUnicodeCmap.cpp b/src/pdf/SkPDFMakeToUnicodeCmap.cpp
index c93aa6f..4f383e1 100644
--- a/src/pdf/SkPDFMakeToUnicodeCmap.cpp
+++ b/src/pdf/SkPDFMakeToUnicodeCmap.cpp
@@ -6,7 +6,9 @@
  */
 
 #include "SkPDFMakeToUnicodeCmap.h"
+
 #include "SkPDFUtils.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 
 static void append_tounicode_header(SkDynamicMemoryWStream* cmap,
diff --git a/src/pdf/SkPDFMetadata.cpp b/src/pdf/SkPDFMetadata.cpp
index ccb3ef3..9234f44 100644
--- a/src/pdf/SkPDFMetadata.cpp
+++ b/src/pdf/SkPDFMetadata.cpp
@@ -5,10 +5,12 @@
  * found in the LICENSE file.
  */
 
+#include "SkPDFMetadata.h"
+
 #include "SkMD5.h"
 #include "SkMilestone.h"
-#include "SkPDFMetadata.h"
 #include "SkPDFTypes.h"
+#include "SkTo.h"
 #include "SkUtils.h"
 
 #include <utility>
diff --git a/src/pdf/SkPDFTypes.cpp b/src/pdf/SkPDFTypes.cpp
index 56d19b1..9e83c7a 100644
--- a/src/pdf/SkPDFTypes.cpp
+++ b/src/pdf/SkPDFTypes.cpp
@@ -5,13 +5,16 @@
  * found in the LICENSE file.
  */
 
+#include "SkPDFTypes.h"
+
 #include "SkData.h"
 #include "SkDeflate.h"
 #include "SkMakeUnique.h"
-#include "SkPDFTypes.h"
 #include "SkPDFUtils.h"
 #include "SkStream.h"
 #include "SkStreamPriv.h"
+#include "SkTo.h"
+
 #include <new>
 
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/src/pdf/SkPDFTypes.h b/src/pdf/SkPDFTypes.h
index bf3e266..434f8ba 100644
--- a/src/pdf/SkPDFTypes.h
+++ b/src/pdf/SkPDFTypes.h
@@ -14,6 +14,7 @@
 #include "SkRefCnt.h"
 #include "SkScalar.h"
 #include "SkTHash.h"
+#include "SkTo.h"
 #include "SkTypes.h"
 
 class SkData;
diff --git a/src/pipe/SkPipeCanvas.cpp b/src/pipe/SkPipeCanvas.cpp
index 911595c..d66953c 100644
--- a/src/pipe/SkPipeCanvas.cpp
+++ b/src/pipe/SkPipeCanvas.cpp
@@ -5,21 +5,23 @@
  * found in the LICENSE file.
  */
 
+#include "SkPipeCanvas.h"
+
 #include "SkAutoMalloc.h"
 #include "SkCanvasPriv.h"
 #include "SkColorFilter.h"
-#include "SkDrawable.h"
 #include "SkDrawLooper.h"
 #include "SkDrawShadowInfo.h"
+#include "SkDrawable.h"
 #include "SkImageFilter.h"
 #include "SkMaskFilter.h"
 #include "SkPathEffect.h"
-#include "SkPipeCanvas.h"
 #include "SkPipeFormat.h"
 #include "SkRSXform.h"
 #include "SkShader.h"
 #include "SkStream.h"
 #include "SkTextBlob.h"
+#include "SkTo.h"
 #include "SkTypeface.h"
 
 template <typename T> void write_rrect(T* writer, const SkRRect& rrect) {
diff --git a/src/ports/SkFontHost_FreeType.cpp b/src/ports/SkFontHost_FreeType.cpp
index d1a47f8..c3cedf1 100644
--- a/src/ports/SkFontHost_FreeType.cpp
+++ b/src/ports/SkFontHost_FreeType.cpp
@@ -15,10 +15,10 @@
 #include "SkFontHost_FreeType_common.h"
 #include "SkGlyph.h"
 #include "SkMakeUnique.h"
+#include "SkMalloc.h"
 #include "SkMask.h"
 #include "SkMaskGamma.h"
 #include "SkMatrix22.h"
-#include "SkMalloc.h"
 #include "SkMutex.h"
 #include "SkOTUtils.h"
 #include "SkPath.h"
@@ -26,6 +26,8 @@
 #include "SkStream.h"
 #include "SkString.h"
 #include "SkTemplates.h"
+#include "SkTo.h"
+
 #include <memory>
 
 #include <ft2build.h>
diff --git a/src/ports/SkFontHost_FreeType_common.cpp b/src/ports/SkFontHost_FreeType_common.cpp
index 2a7a4ba..5627304 100644
--- a/src/ports/SkFontHost_FreeType_common.cpp
+++ b/src/ports/SkFontHost_FreeType_common.cpp
@@ -13,6 +13,7 @@
 #include "SkFDot6.h"
 #include "SkFontHost_FreeType_common.h"
 #include "SkPath.h"
+#include "SkTo.h"
 
 #include <ft2build.h>
 #include FT_FREETYPE_H
diff --git a/src/ports/SkFontHost_mac.cpp b/src/ports/SkFontHost_mac.cpp
index 3cc51d4..4c06e96 100644
--- a/src/ports/SkFontHost_mac.cpp
+++ b/src/ports/SkFontHost_mac.cpp
@@ -42,6 +42,7 @@
 #include "SkStream.h"
 #include "SkString.h"
 #include "SkTemplates.h"
+#include "SkTo.h"
 #include "SkTypefaceCache.h"
 #include "SkTypeface_mac.h"
 #include "SkUtils.h"
diff --git a/src/ports/SkFontHost_win.cpp b/src/ports/SkFontHost_win.cpp
index a202a72..a9c0afc 100644
--- a/src/ports/SkFontHost_win.cpp
+++ b/src/ports/SkFontHost_win.cpp
@@ -20,21 +20,21 @@
 #include "SkMakeUnique.h"
 #include "SkMaskGamma.h"
 #include "SkMatrix22.h"
-#include "SkOnce.h"
 #include "SkOTTable_OS_2.h"
 #include "SkOTTable_maxp.h"
 #include "SkOTTable_name.h"
 #include "SkOTUtils.h"
+#include "SkOnce.h"
 #include "SkPath.h"
 #include "SkSFNTHeader.h"
 #include "SkStream.h"
 #include "SkString.h"
 #include "SkTemplates.h"
-#include "SkTypeface_win.h"
+#include "SkTo.h"
 #include "SkTypefaceCache.h"
+#include "SkTypeface_win.h"
 #include "SkUtils.h"
 
-#include "SkTypes.h"
 #include <tchar.h>
 #include <usp10.h>
 #include <objbase.h>
diff --git a/src/ports/SkScalerContext_win_dw.cpp b/src/ports/SkScalerContext_win_dw.cpp
index 98d8ca8..fa6b910 100644
--- a/src/ports/SkScalerContext_win_dw.cpp
+++ b/src/ports/SkScalerContext_win_dw.cpp
@@ -10,9 +10,9 @@
 
 #undef GetGlyphIndices
 
-#include "SkDraw.h"
 #include "SkDWrite.h"
 #include "SkDWriteGeometrySink.h"
+#include "SkDraw.h"
 #include "SkEndian.h"
 #include "SkGlyph.h"
 #include "SkHRESULT.h"
@@ -29,6 +29,7 @@
 #include "SkScalerContext_win_dw.h"
 #include "SkSharedMutex.h"
 #include "SkTScopedComPtr.h"
+#include "SkTo.h"
 #include "SkTypeface_win_dw.h"
 
 #include <dwrite.h>
diff --git a/src/ports/SkTypeface_win_dw.cpp b/src/ports/SkTypeface_win_dw.cpp
index d67350a..a7bad0d 100644
--- a/src/ports/SkTypeface_win_dw.cpp
+++ b/src/ports/SkTypeface_win_dw.cpp
@@ -18,14 +18,15 @@
 #include "SkDWriteFontFileStream.h"
 #include "SkFontDescriptor.h"
 #include "SkFontStream.h"
+#include "SkOTTable_OS_2.h"
 #include "SkOTTable_fvar.h"
 #include "SkOTTable_head.h"
 #include "SkOTTable_hhea.h"
-#include "SkOTTable_OS_2.h"
 #include "SkOTTable_post.h"
 #include "SkOTUtils.h"
 #include "SkScalerContext.h"
 #include "SkScalerContext_win_dw.h"
+#include "SkTo.h"
 #include "SkTypeface_win_dw.h"
 #include "SkUtils.h"
 
diff --git a/src/sfnt/SkOTUtils.cpp b/src/sfnt/SkOTUtils.cpp
index f46f86c..1bd051c 100644
--- a/src/sfnt/SkOTUtils.cpp
+++ b/src/sfnt/SkOTUtils.cpp
@@ -15,6 +15,7 @@
 #include "SkOTTable_name.h"
 #include "SkSFNTHeader.h"
 #include "SkStream.h"
+#include "SkTo.h"
 
 extern const uint8_t SK_OT_GlyphData_NoOutline[] = {
     0x0,0x0, //SkOTTableGlyphData::numberOfContours
diff --git a/src/svg/SkSVGDevice.cpp b/src/svg/SkSVGDevice.cpp
index 3462f7c..d552803 100644
--- a/src/svg/SkSVGDevice.cpp
+++ b/src/svg/SkSVGDevice.cpp
@@ -25,6 +25,7 @@
 #include "SkShader.h"
 #include "SkStream.h"
 #include "SkTHash.h"
+#include "SkTo.h"
 #include "SkTypeface.h"
 #include "SkUtils.h"
 #include "SkXMLWriter.h"
diff --git a/src/utils/SkInterpolator.cpp b/src/utils/SkInterpolator.cpp
index d64316d..141adaf 100644
--- a/src/utils/SkInterpolator.cpp
+++ b/src/utils/SkInterpolator.cpp
@@ -8,9 +8,10 @@
 #include "SkInterpolator.h"
 
 #include "SkFixed.h"
-#include "SkMath.h"
 #include "SkMalloc.h"
+#include "SkMath.h"
 #include "SkTSearch.h"
+#include "SkTo.h"
 
 SkInterpolatorBase::SkInterpolatorBase() {
     fStorage    = nullptr;
diff --git a/src/utils/SkLua.cpp b/src/utils/SkLua.cpp
index 53e8bb3..887e251 100644
--- a/src/utils/SkLua.cpp
+++ b/src/utils/SkLua.cpp
@@ -30,6 +30,7 @@
 #include "SkString.h"
 #include "SkSurface.h"
 #include "SkTextBlob.h"
+#include "SkTo.h"
 #include "SkTypeface.h"
 #include <new>
 
diff --git a/src/utils/SkLuaCanvas.cpp b/src/utils/SkLuaCanvas.cpp
index 53e462a..c7e3064 100644
--- a/src/utils/SkLuaCanvas.cpp
+++ b/src/utils/SkLuaCanvas.cpp
@@ -9,6 +9,7 @@
 
 #include "SkLua.h"
 #include "SkStringUtils.h"
+#include "SkTo.h"
 
 extern "C" {
     #include "lua.h"
diff --git a/src/utils/SkMultiPictureDocument.cpp b/src/utils/SkMultiPictureDocument.cpp
index 493e6d4..f7081e6 100644
--- a/src/utils/SkMultiPictureDocument.cpp
+++ b/src/utils/SkMultiPictureDocument.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "SkMultiPictureDocument.h"
+
 #include "SkMultiPictureDocumentPriv.h"
 #include "SkNWayCanvas.h"
 #include "SkPicture.h"
@@ -13,6 +14,7 @@
 #include "SkSerialProcs.h"
 #include "SkStream.h"
 #include "SkTArray.h"
+#include "SkTo.h"
 
 #include <limits.h>
 
diff --git a/src/utils/SkPatchUtils.cpp b/src/utils/SkPatchUtils.cpp
index 8fafd14..a28abdf 100644
--- a/src/utils/SkPatchUtils.cpp
+++ b/src/utils/SkPatchUtils.cpp
@@ -10,6 +10,7 @@
 #include "SkColorData.h"
 #include "SkGeometry.h"
 #include "SkPM4f.h"
+#include "SkTo.h"
 
 namespace {
     enum CubicCtrlPts {
diff --git a/src/utils/mac/SkCreateCGImageRef.cpp b/src/utils/mac/SkCreateCGImageRef.cpp
index e7a78b0..300e23b 100644
--- a/src/utils/mac/SkCreateCGImageRef.cpp
+++ b/src/utils/mac/SkCreateCGImageRef.cpp
@@ -12,6 +12,7 @@
 #include "SkCGUtils.h"
 #include "SkColorData.h"
 #include "SkMacros.h"
+#include "SkTo.h"
 
 static CGBitmapInfo ComputeCGAlphaInfo_RGBA(SkAlphaType at) {
     CGBitmapInfo info = kCGBitmapByteOrder32Big;
diff --git a/src/views/SkView.cpp b/src/views/SkView.cpp
index 6c90988..26ee1ea 100644
--- a/src/views/SkView.cpp
+++ b/src/views/SkView.cpp
@@ -6,7 +6,9 @@
  */
 
 #include "SkView.h"
+
 #include "SkCanvas.h"
+#include "SkTo.h"
 
 static inline uint32_t SkSetClearShift(uint32_t bits, bool cond, unsigned shift) {
     SkASSERT((int)cond == 0 || (int)cond == 1);
diff --git a/src/xml/SkDOM.cpp b/src/xml/SkDOM.cpp
index 2e37dd7..e6c3435 100644
--- a/src/xml/SkDOM.cpp
+++ b/src/xml/SkDOM.cpp
@@ -5,9 +5,10 @@
  * found in the LICENSE file.
  */
 
-
 #include "SkDOM.h"
+
 #include "SkStream.h"
+#include "SkTo.h"
 #include "SkXMLParser.h"
 #include "SkXMLWriter.h"
 
diff --git a/src/xml/SkXMLParser.cpp b/src/xml/SkXMLParser.cpp
index 23c4e67..36e1ab3 100644
--- a/src/xml/SkXMLParser.cpp
+++ b/src/xml/SkXMLParser.cpp
@@ -5,12 +5,14 @@
  * found in the LICENSE file.
  */
 
+#include "SkXMLParser.h"
+
 #include "expat.h"
 
 #include "SkStream.h"
 #include "SkString.h"
+#include "SkTo.h"
 #include "SkTypes.h"
-#include "SkXMLParser.h"
 
 static char const* const gErrorStrings[] = {
     "empty or missing file ",
diff --git a/src/xml/SkXMLWriter.cpp b/src/xml/SkXMLWriter.cpp
index 67dcf59..0be9c55 100644
--- a/src/xml/SkXMLWriter.cpp
+++ b/src/xml/SkXMLWriter.cpp
@@ -6,7 +6,9 @@
  */
 
 #include "SkXMLWriter.h"
+
 #include "SkStream.h"
+#include "SkTo.h"
 
 SkXMLWriter::SkXMLWriter(bool doEscapeMarkup) : fDoEscapeMarkup(doEscapeMarkup)
 {}
diff --git a/src/xps/SkXPSDevice.cpp b/src/xps/SkXPSDevice.cpp
index ef5f488..36d1bd1 100644
--- a/src/xps/SkXPSDevice.cpp
+++ b/src/xps/SkXPSDevice.cpp
@@ -49,6 +49,7 @@
 #include "SkTLazy.h"
 #include "SkTScopedComPtr.h"
 #include "SkTTCFHeader.h"
+#include "SkTo.h"
 #include "SkTypefacePriv.h"
 #include "SkUtils.h"
 #include "SkVertices.h"