Make 2D canvas disable gpu acceleration when getImageData is called

third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp

Index: third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp b/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
index ccc1972b4c5258a934ce745d65d6dac9025ae82e..406c50f366cffdd860744467f4efb1f10f727acf 100644
--- a/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
@@ -35,6 +35,7 @@
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/geometry/IntRect.h"
+#include "platform/graphics/ExpensiveCanvasHeuristicParameters.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageBufferClient.h"
 #include "platform/graphics/StaticBitmapImage.h"
@@ -300,7 +301,8 @@ bool ImageBuffer::getImageData(Multiply multiplied, const IntRect& rect, WTF::Ar
     }
 
     ASSERT(canvas());
-    RefPtr<SkImage> snapshot = m_surface->newImageSnapshot(PreferNoAcceleration, SnapshotReasonGetImageData);
+    AccelerationHint hint = ExpensiveCanvasHeuristicParameters::GetImageDataForcesNoAcceleration ? ForceNoAcceleration : PreferNoAcceleration;

[xidachen, 2016/06/15 14:12:36]

We should probably do the same thing in putImageData() as well.

+    RefPtr<SkImage> snapshot = m_surface->newImageSnapshot(hint, SnapshotReasonGetImageData);
     if (!snapshot)
         return false;