Implement OffscreenCanvas Accelerated 2D commit()

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 647 matching lines @@
         return;
     }
     // no HTMLCanvas associated, thrown InvalidStateError
     if (getOffscreenCanvas()->getAssociatedCanvasId() == -1) {
         exceptionState.throwDOMException(InvalidStateError, "Commit() was called on a context whose OffscreenCanvas is not associated with a canvas element.");
         return;
     }
     if (!drawingBuffer())
         return;
     // TODO(crbug.com/646864): Make commit() work correctly with { preserveDrawingBuffer : true }.
-    getOffscreenCanvas()->getOrCreateFrameDispatcher()->dispatchFrame(std::move(drawingBuffer()->transferToStaticBitmapImage()));
+    getOffscreenCanvas()->getOrCreateFrameDispatcher()->dispatchFrame(std::move(drawingBuffer()->transferToStaticBitmapImage()), this->isAccelerated());

[xlai (Olivia), 2016/09/22 16:12:24]

In WebGL, this->isAccelerated() is confirmed to return true. But in 2D context,
it can return either true or false.

 }
 
 PassRefPtr<Image> WebGLRenderingContextBase::getImage(AccelerationHint hint, SnapshotReason reason) const
 {
     if (!drawingBuffer())
         return nullptr;
 
     drawingBuffer()->commit();
     IntSize size = clampedCanvasSize();
     OpacityMode opacityMode = creationAttributes().hasAlpha() ? NonOpaque : Opaque;
@@ skipping 5794 matching lines @@
 
 void WebGLRenderingContextBase::getHTMLOrOffscreenCanvas(HTMLCanvasElementOrOffscreenCanvas& result) const
 {
     if (canvas())
         result.setHTMLCanvasElement(canvas());
     else
         result.setOffscreenCanvas(getOffscreenCanvas());
 }
 
 } // namespace blink