Phase II Step 3: Reload LoFi/placeholder images via new ImageResource

third_party/WebKit/Source/core/fetch/MockResourceClient.h

 /*
  * Copyright (c) 2013, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 39 matching lines @@
   String debugName() const override { return "MockResourceClient"; }
   virtual bool notifyFinishedCalled() const { return m_notifyFinishedCalled; }
 
   size_t encodedSizeOnNotifyFinished() const {
     return m_encodedSizeOnNotifyFinished;
   }
 
   virtual void removeAsClient();
   virtual void dispose();
 
-  DECLARE_TRACE();
+  DECLARE_VIRTUAL_TRACE();
 
  protected:
   Member<Resource> m_resource;
   bool m_notifyFinishedCalled;
   size_t m_encodedSizeOnNotifyFinished;
 };
 
 }  // namespace blink
 
 #endif  // MockResourceClient_h