diff --git a/src/gpu/GrAtlasTextBlob.cpp b/src/gpu/GrAtlasTextBlob.cpp
new file mode 100644
index 0000000..d357145
--- /dev/null
+++ b/src/gpu/GrAtlasTextBlob.cpp
@@ -0,0 +1,109 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrAtlasTextBlob.h"
+
+#ifdef CACHE_SANITY_CHECK
+void GrAtlasTextBlob::AssertEqual(const GrAtlasTextBlob& l, const GrAtlasTextBlob& r) {
+    SkASSERT(l.fSize == r.fSize);
+    SkASSERT(l.fPool == r.fPool);
+
+    SkASSERT(l.fBlurRec.fSigma == r.fBlurRec.fSigma);
+    SkASSERT(l.fBlurRec.fStyle == r.fBlurRec.fStyle);
+    SkASSERT(l.fBlurRec.fQuality == r.fBlurRec.fQuality);
+
+    SkASSERT(l.fStrokeInfo.fFrameWidth == r.fStrokeInfo.fFrameWidth);
+    SkASSERT(l.fStrokeInfo.fMiterLimit == r.fStrokeInfo.fMiterLimit);
+    SkASSERT(l.fStrokeInfo.fJoin == r.fStrokeInfo.fJoin);
+
+    SkASSERT(l.fBigGlyphs.count() == r.fBigGlyphs.count());
+    for (int i = 0; i < l.fBigGlyphs.count(); i++) {
+        const BigGlyph& lBigGlyph = l.fBigGlyphs[i];
+        const BigGlyph& rBigGlyph = r.fBigGlyphs[i];
+
+        SkASSERT(lBigGlyph.fPath == rBigGlyph.fPath);
+        // We can't assert that these have the same translations
+    }
+
+    SkASSERT(l.fKey == r.fKey);
+    SkASSERT(l.fViewMatrix.cheapEqualTo(r.fViewMatrix));
+    SkASSERT(l.fPaintColor == r.fPaintColor);
+    SkASSERT(l.fMaxMinScale == r.fMaxMinScale);
+    SkASSERT(l.fMinMaxScale == r.fMinMaxScale);
+    SkASSERT(l.fTextType == r.fTextType);
+
+    SkASSERT(l.fRunCount == r.fRunCount);
+    for (int i = 0; i < l.fRunCount; i++) {
+        const Run& lRun = l.fRuns[i];
+        const Run& rRun = r.fRuns[i];
+
+        if (lRun.fStrike.get()) {
+            SkASSERT(rRun.fStrike.get());
+            SkASSERT(GrBatchTextStrike::GetKey(*lRun.fStrike) ==
+                     GrBatchTextStrike::GetKey(*rRun.fStrike));
+
+        } else {
+            SkASSERT(!rRun.fStrike.get());
+        }
+
+        if (lRun.fTypeface.get()) {
+            SkASSERT(rRun.fTypeface.get());
+            SkASSERT(SkTypeface::Equal(lRun.fTypeface, rRun.fTypeface));
+        } else {
+            SkASSERT(!rRun.fTypeface.get());
+        }
+
+        // TODO BOUNDS ARE ALL MESSED UP
+        //SkASSERT(lRun.fVertexBounds == rRun.fVertexBounds);
+
+        SkASSERT(lRun.fDescriptor.getDesc());
+        SkASSERT(rRun.fDescriptor.getDesc());
+        SkASSERT(lRun.fDescriptor.getDesc()->equals(*rRun.fDescriptor.getDesc()));
+
+        if (lRun.fOverrideDescriptor.get()) {
+            SkASSERT(lRun.fOverrideDescriptor->getDesc());
+            SkASSERT(rRun.fOverrideDescriptor.get() && rRun.fOverrideDescriptor->getDesc());;
+            SkASSERT(lRun.fOverrideDescriptor->getDesc()->equals(
+                    *rRun.fOverrideDescriptor->getDesc()));
+        } else {
+            SkASSERT(!rRun.fOverrideDescriptor.get());
+        }
+
+        // color can be changed
+        //SkASSERT(lRun.fColor == rRun.fColor);
+        SkASSERT(lRun.fInitialized == rRun.fInitialized);
+        SkASSERT(lRun.fDrawAsPaths == rRun.fDrawAsPaths);
+
+        SkASSERT(lRun.fSubRunInfo.count() == rRun.fSubRunInfo.count());
+        for(int j = 0; j < lRun.fSubRunInfo.count(); j++) {
+            const Run::SubRunInfo& lSubRun = lRun.fSubRunInfo[j];
+            const Run::SubRunInfo& rSubRun = rRun.fSubRunInfo[j];
+
+            SkASSERT(lSubRun.fVertexStartIndex == rSubRun.fVertexStartIndex);
+            SkASSERT(lSubRun.fVertexEndIndex == rSubRun.fVertexEndIndex);
+            SkASSERT(lSubRun.fGlyphStartIndex == rSubRun.fGlyphStartIndex);
+            SkASSERT(lSubRun.fGlyphEndIndex == rSubRun.fGlyphEndIndex);
+            SkASSERT(lSubRun.fTextRatio == rSubRun.fTextRatio);
+            SkASSERT(lSubRun.fMaskFormat == rSubRun.fMaskFormat);
+            SkASSERT(lSubRun.fDrawAsDistanceFields == rSubRun.fDrawAsDistanceFields);
+            SkASSERT(lSubRun.fUseLCDText == rSubRun.fUseLCDText);
+
+            //We can't compare the bulk use tokens with this method
+            /*
+            SkASSERT(lSubRun.fBulkUseToken.fPlotsToUpdate.count() ==
+                     rSubRun.fBulkUseToken.fPlotsToUpdate.count());
+            SkASSERT(lSubRun.fBulkUseToken.fPlotAlreadyUpdated ==
+                     rSubRun.fBulkUseToken.fPlotAlreadyUpdated);
+            for (int k = 0; k < lSubRun.fBulkUseToken.fPlotsToUpdate.count(); k++) {
+                SkASSERT(lSubRun.fBulkUseToken.fPlotsToUpdate[k] ==
+                         rSubRun.fBulkUseToken.fPlotsToUpdate[k]);
+            }*/
+        }
+    }
+}
+
+#endif