Synchronize OffscreenCanvas content with the placeholder canvas

third_party/WebKit/Source/platform/graphics/Image.h

Index: third_party/WebKit/Source/platform/graphics/Image.h
diff --git a/third_party/WebKit/Source/platform/graphics/Image.h b/third_party/WebKit/Source/platform/graphics/Image.h
index 61ae170e1fc0fc7c714de703728f5cb95cd7d02b..87f940d7eaca09d19220556440e9842580693c49 100644
--- a/third_party/WebKit/Source/platform/graphics/Image.h
+++ b/third_party/WebKit/Source/platform/graphics/Image.h
@@ -84,6 +84,7 @@ class PLATFORM_EXPORT Image : public ThreadSafeRefCounted<Image> {
   virtual bool currentFrameIsComplete() { return false; }
   virtual bool currentFrameIsLazyDecoded() { return false; }
   virtual bool isTextureBacked();
+  virtual void transfer() {}

[xidachen, 2016/11/14 19:05:03]

I am not sure why this function is moved from StaticBitmapImage to Image. The
StaticBitmapImage should be the only class that is transferable.

 
   // Derived classes should override this if they can assure that the current
   // image frame contains only resources from its own security origin.