guard to remove DrawBitmapRectFlags

BUG=skia:

Review URL: https://codereview.chromium.org/1235393003
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 35551e7..941d868 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -1772,6 +1772,12 @@
     this->onDrawImageRect(image, src, dst, paint SRC_RECT_CONSTRAINT_ARG(constraint));
 }
 
+void SkCanvas::drawImageRect(const SkImage* image, const SkIRect& isrc, const SkRect& dst,
+                             const SkPaint* paint, SrcRectConstraint constraint) {
+    SkRect src = SkRect::Make(isrc);
+    this->drawImageRect(image, &src, dst, paint, constraint);
+}
+
 void SkCanvas::drawImageNine(const SkImage* image, const SkIRect& center, const SkRect& dst,
                              const SkPaint* paint) {
     if (dst.isEmpty()) {
@@ -1790,6 +1796,7 @@
     this->onDrawBitmap(bitmap, dx, dy, paint);
 }
 
+#ifdef SK_SUPPORT_LEGACY_DRAWBITMAPRECTFLAGS_TYPE
 void SkCanvas::drawBitmapRectToRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst,
                                     const SkPaint* paint, DrawBitmapRectFlags flags) {
     if (bitmap.drawsNothing() || dst.isEmpty()) {
@@ -1797,6 +1804,7 @@
     }
     this->onDrawBitmapRect(bitmap, src, dst, paint, (SK_VIRTUAL_CONSTRAINT_TYPE)flags);
 }
+#endif
 
 void SkCanvas::drawBitmapRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst,
                               const SkPaint* paint, SrcRectConstraint constraint) {
@@ -1806,6 +1814,12 @@
     this->onDrawBitmapRect(bitmap, src, dst, paint, (SK_VIRTUAL_CONSTRAINT_TYPE)constraint);
 }
 
+void SkCanvas::drawBitmapRect(const SkBitmap& bitmap, const SkIRect& isrc, const SkRect& dst,
+                              const SkPaint* paint, SrcRectConstraint constraint) {
+    SkRect src = SkRect::Make(isrc);
+    this->drawBitmapRect(bitmap, &src, dst, paint, constraint);
+}
+
 void SkCanvas::drawBitmapNine(const SkBitmap& bitmap, const SkIRect& center, const SkRect& dst,
                               const SkPaint* paint) {
     if (bitmap.drawsNothing() || dst.isEmpty()) {
diff --git a/src/effects/SkTestImageFilters.cpp b/src/effects/SkTestImageFilters.cpp
index ea5560f..cd277ec 100755
--- a/src/effects/SkTestImageFilters.cpp
+++ b/src/effects/SkTestImageFilters.cpp
@@ -71,7 +71,7 @@
 
         SkRect r = SkRect::MakeWH(SkIntToScalar(src.width()),
                                   SkIntToScalar(src.height()));
-        canvas.drawBitmapRect(tmp, NULL, r, NULL);
+        canvas.drawBitmapRect(tmp, r);
         *result = dev->accessBitmap(false);
     }
     return true;
diff --git a/src/gpu/SkGr.cpp b/src/gpu/SkGr.cpp
index bb04131..3334095 100644
--- a/src/gpu/SkGr.cpp
+++ b/src/gpu/SkGr.cpp
@@ -529,7 +529,7 @@
             break;
     }
     SkRect dstRect = SkRect::MakeWH(SkIntToScalar(stretch.fWidth), SkIntToScalar(stretch.fHeight));
-    canvas.drawBitmapRectToRect(bmp, NULL, dstRect, &paint);
+    canvas.drawBitmapRect(bmp, dstRect, &paint);
     return stretched;
 }
 
diff --git a/src/utils/SkNinePatch.cpp b/src/utils/SkNinePatch.cpp
index ce8d480..4a5308b 100644
--- a/src/utils/SkNinePatch.cpp
+++ b/src/utils/SkNinePatch.cpp
@@ -136,7 +136,7 @@
     const int numYStretch = (numYDivs + 1) >> 1;
 
     if (numXStretch < 1 && numYStretch < 1) {
-        canvas->drawBitmapRect(bitmap, NULL, bounds, paint);
+        canvas->drawBitmapRect(bitmap, bounds, paint);
         return;
     }
 
@@ -293,7 +293,7 @@
             s.fRight = srcX[x+1];
             d.fLeft = dstX[x];
             d.fRight = dstX[x+1];
-            canvas->drawBitmapRect(bitmap, &s, d, paint);
+            canvas->drawBitmapRect(bitmap, s, d, paint);
         }
     }
 }
diff --git a/src/utils/debugger/SkDrawCommand.cpp b/src/utils/debugger/SkDrawCommand.cpp
index 5f0f74f..1d28d2e 100644
--- a/src/utils/debugger/SkDrawCommand.cpp
+++ b/src/utils/debugger/SkDrawCommand.cpp
@@ -129,7 +129,7 @@
                                   yScale * input.height());
 
     canvas->clear(0xFFFFFFFF);
-    canvas->drawBitmapRect(input, NULL, dst);
+    canvas->drawBitmapRect(input, dst);
 
     if (srcRect) {
         SkRect r = SkRect::MakeLTRB(srcRect->fLeft * xScale + SK_Scalar1,