[ImageResource 0b] Decouple ImageResourceObserver::imageNotifyFinished() from notifyFinished()

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

Index: third_party/WebKit/Source/core/fetch/ImageResource.h
diff --git a/third_party/WebKit/Source/core/fetch/ImageResource.h b/third_party/WebKit/Source/core/fetch/ImageResource.h
index e8780284d5540b2a92f03df906d8bda71e5222ba..2d2b657db0bf936115f91bebc31fa7911502798c 100644
--- a/third_party/WebKit/Source/core/fetch/ImageResource.h
+++ b/third_party/WebKit/Source/core/fetch/ImageResource.h
@@ -190,8 +190,9 @@ class CORE_EXPORT ImageResource final
   void updateImage(bool allDataReceived);
   void updateImageAndClearBuffer();
   void clearImage();
+  enum NotifyFinishOption { ShouldNotifyFinish, DoNotNotifyFinish };
   // If not null, changeRect is the changed part of the image.
-  void notifyObservers(const IntRect* changeRect = nullptr);
+  void notifyObservers(NotifyFinishOption, const IntRect* changeRect = nullptr);
 
   void ensureImage();