Fix 2D canvas entiring invalid state when painted during hibernation

third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.cpp

 /*
  * Copyright (C) 2012 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
@@ skipping 929 matching lines @@
     unregisterTaskObserver();
 }
 
 void Canvas2DLayerBridge::willProcessTask()
 {
     ASSERT_NOT_REACHED();
 }
 
 PassRefPtr<SkImage> Canvas2DLayerBridge::newImageSnapshot(AccelerationHint hint, SnapshotReason)
 {
+    if (isHibernating())
+        return m_hibernationImage;
     if (!checkSurfaceValid())
         return nullptr;
     if (!getOrCreateSurface(hint))
         return nullptr;
     flush();
     // A readback operation may alter the texture parameters, which may affect
     // the compositor's behavior. Therefore, we must trigger copy-on-write
     // even though we are not technically writing to the texture, only to its
     // parameters.
     getOrCreateSurface()->notifyContentWillChange(SkSurface::kRetain_ContentChangeMode);
@@ skipping 32 matching lines @@
 #endif // USE_IOSURFACE_FOR_2D_CANVAS
 }
 
 void Canvas2DLayerBridge::Logger::reportHibernationEvent(HibernationEvent event)
 {
     DEFINE_STATIC_LOCAL(EnumerationHistogram, hibernationHistogram, ("Canvas.HibernationEvents", HibernationEventCount));
     hibernationHistogram.count(event);
 }
 
 } // namespace blink