Ensure |m_image| is (re-)created in ImageResource::didAddClient()

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 da0995f2be6bd16bcc3322560240f8f7a1f3528b..55e869faa7e0642f8d3a8ceccfef153240cf6cde 100644
--- a/third_party/WebKit/Source/core/fetch/ImageResource.h
+++ b/third_party/WebKit/Source/core/fetch/ImageResource.h
@@ -91,6 +91,8 @@ public:
     // the Lo-Fi state set to off and bypassing the cache.
     void reloadIfLoFi(ResourceFetcher*);
 
+    void didAddClient(ResourceClient*) override;
+
     void addObserver(ImageResourceObserver*);
     void removeObserver(ImageResourceObserver*);
     bool hasClientsOrObservers() const override { return Resource::hasClientsOrObservers() || !m_observers.isEmpty() || !m_finishedObservers.isEmpty(); }
@@ -158,6 +160,8 @@ private:
     // If not null, changeRect is the changed part of the image.
     void notifyObservers(const IntRect* changeRect = nullptr);
 
+    void ensureImage();
+
     void checkNotify() override;
     void markClientsAndObserversFinished() override;