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

third_party/WebKit/Source/core/fetch/MockResourceClients.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 42 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;
 };
 
+// MockImageResourceClient isn't re-registered to the new ImageResource
+// in LoFi image reloading.
 class MockImageResourceClient final : public MockResourceClient,
                                       public ImageResourceObserver {
  public:
   explicit MockImageResourceClient(ImageResource*);
   ~MockImageResourceClient() override;
 
   void imageNotifyFinished(ImageResourceContent*) override;
   void imageChanged(ImageResourceContent*, const IntRect*) override;
 
   String debugName() const override { return "MockImageResourceClient"; }
 
   bool notifyFinishedCalled() const override;
 
-  void removeAsClient() override;
+  void removeAsClientAndObserver();
   void dispose() override;
 
   int imageChangedCount() const { return m_imageChangedCount; }
   int imageNotifyFinishedCount() const { return m_imageNotifyFinishedCount; }
 
   size_t encodedSizeOnLastImageChanged() const {
     return m_encodedSizeOnLastImageChanged;
   }
   size_t encodedSizeOnImageNotifyFinished() const {
     return m_encodedSizeOnImageNotifyFinished;
   }
 
+  DEFINE_INLINE_VIRTUAL_TRACE() {
+    visitor->trace(m_content);
+    MockResourceClient::trace(visitor);
+  }
+
  private:
   int m_imageChangedCount;
   size_t m_encodedSizeOnLastImageChanged;
   int m_imageNotifyFinishedCount;
   size_t m_encodedSizeOnImageNotifyFinished;
+  Member<ImageResourceContent> m_content;
 };
 
 }  // namespace blink
 
 #endif  // MockResourceClients_h