Fix missing finalizeFrame barriers in WebGL animations

third_party/WebKit/Source/core/html/canvas/CanvasRenderingContext.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 142 matching lines @@
   if (!m_finalizeFrameScheduled) {
     m_finalizeFrameScheduled = true;
     Platform::current()->currentThread()->addTaskObserver(this);
   }
 }
 
 void CanvasRenderingContext::didProcessTask() {
   Platform::current()->currentThread()->removeTaskObserver(this);
   m_finalizeFrameScheduled = false;
 
-  if (!canvas())
-    return;
-
   // The end of a script task that drew content to the canvas is the point
   // at which the current frame may be considered complete.
-  canvas()->finalizeFrame();
+  if (canvas())
+    canvas()->finalizeFrame();
+  finalizeFrame();
 }
 
 CanvasRenderingContext::ContextType CanvasRenderingContext::contextTypeFromId(
     const String& id) {
   if (id == "2d")
     return Context2d;
   if (id == "experimental-webgl")
     return ContextExperimentalWebgl;
   if (id == "webgl")
     return ContextWebgl;
@@ skipping 42 matching lines @@
   }
   return taintOrigin;
 }
 
 DEFINE_TRACE(CanvasRenderingContext) {
   visitor->trace(m_canvas);
   visitor->trace(m_offscreenCanvas);
 }
 
 }  // namespace blink