Phase III Step 1: Make ImageResourceContent manage its own ResourceStatus

third_party/WebKit/Source/core/loader/resource/ImageResource.h

Index: third_party/WebKit/Source/core/loader/resource/ImageResource.h
diff --git a/third_party/WebKit/Source/core/loader/resource/ImageResource.h b/third_party/WebKit/Source/core/loader/resource/ImageResource.h
index 9e2170604147044821ad13f40c037015841dc96d..53df5914a3448bfa1fa4a883e0bfb347378c0cf9 100644
--- a/third_party/WebKit/Source/core/loader/resource/ImageResource.h
+++ b/third_party/WebKit/Source/core/loader/resource/ImageResource.h
@@ -88,6 +88,7 @@ class CORE_EXPORT ImageResource final
   void responseReceived(const ResourceResponse&,
                         std::unique_ptr<WebDataConsumerHandle>) override;
   void finish(double finishTime = 0.0) override;
+  void notifyStartLoad() override;
 
   // For compatibility, images keep loading even if there are HTTP errors.
   bool shouldIgnoreHTTPStatusCodeErrors() const override { return true; }