Merge 126540 - [chromium] Fix lost context when textures are evicted

Source/WebCore/platform/graphics/chromium/cc/CCSingleThreadProxy.cpp

 /*
  * Copyright (C) 2011 Google 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 138 matching lines @@
     ASSERT(CCProxy::isMainThread());
     ASSERT(m_contextLost);
 
     OwnPtr<CCGraphicsContext> context = m_layerTreeHost->createContext();
     if (!context)
         return false;
 
     bool initialized;
     {
         DebugScopedSetImplThread impl;
-        m_layerTreeHost->deleteContentsTexturesOnImplThread(m_layerTreeHostImpl->resourceProvider());
+        if (!m_layerTreeHostImpl->contentsTexturesPurged())
+            m_layerTreeHost->deleteContentsTexturesOnImplThread(m_layerTreeHostImpl->resourceProvider());
         initialized = m_layerTreeHostImpl->initializeLayerRenderer(context.release(), UnthrottledUploader);
         if (initialized) {
             m_layerRendererCapabilitiesForMainThread = m_layerTreeHostImpl->layerRendererCapabilities();
         }
     }
 
     if (initialized)
         m_contextLost = false;
 
     return initialized;
@@ skipping 180 matching lines @@
 
 void CCSingleThreadProxy::didSwapFrame()
 {
     if (m_nextFrameIsNewlyCommittedFrame) {
         m_nextFrameIsNewlyCommittedFrame = false;
         m_layerTreeHost->didCommitAndDrawFrame();
     }
 }
 
 }