Synchronize commits at end of JS task

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 1421 matching lines @@
     if (layoutBox && layoutBox->hasAcceleratedCompositing()) {
       layoutBox->contentChanged(changeType);
     }
     IntSize canvasSize = clampedCanvasSize();
     didDraw(SkIRect::MakeXYWH(0, 0, canvasSize.width(), canvasSize.height()));
   }
 }
 
 void WebGLRenderingContextBase::finalizeFrame() {
   m_animationFrameInProgress = false;
+  if (offscreenCanvas()) {
+    offscreenCanvas()->doCommitAtEndOfTask();
+  }
 }
 
 void WebGLRenderingContextBase::onErrorMessage(const char* message,
                                                int32_t id) {
   if (m_synthesizedErrorsToConsole)
     printGLErrorToConsole(message);
   probe::didFireWebGLErrorOrWarning(canvas(), message);
 }
 
 void WebGLRenderingContextBase::notifyCanvasContextChanged() {
@@ skipping 6393 matching lines @@
 
 void WebGLRenderingContextBase::getHTMLOrOffscreenCanvas(
     HTMLCanvasElementOrOffscreenCanvas& result) const {
   if (canvas())
     result.setHTMLCanvasElement(canvas());
   else
     result.setOffscreenCanvas(offscreenCanvas());
 }
 
 }  // namespace blink