Emit error events if the loading of an object element failed

third_party/WebKit/public/web/WebPlugin.h

Index: third_party/WebKit/public/web/WebPlugin.h
diff --git a/third_party/WebKit/public/web/WebPlugin.h b/third_party/WebKit/public/web/WebPlugin.h
index 8d2078b19a07b3f57843463908a0fc1f84d7a3a3..398a2803be05bc6514d6b7c5d407a543fc32175b 100644
--- a/third_party/WebKit/public/web/WebPlugin.h
+++ b/third_party/WebKit/public/web/WebPlugin.h
@@ -233,10 +233,12 @@ class WebPlugin {
   // Rotates the plugin's view of its content.
   virtual void rotateView(RotationType type) {}
 
-  virtual bool isPlaceholder() { return true; }
+  virtual bool isPlaceholder() { return placeholder; }
+  virtual void markAsPlaceholder() { placeholder = true; }
 
  protected:
   ~WebPlugin() {}
+  bool placeholder = false;
 };
 
 }  // namespace blink