Emit error events if the loading of an object element failed

third_party/WebKit/Source/platform/FrameViewBase.h

 /*
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2008 Collabora Ltd.  All rights reserved.
  * 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 75 matching lines @@
   bool isVisible() const {
     return m_selfVisible && m_parentVisible;
   }  // Whether or not we are actually visible.
   virtual void setParentVisible(bool visible) { m_parentVisible = visible; }
   void setSelfVisible(bool v) { m_selfVisible = v; }
 
   virtual bool isFrameView() const { return false; }
   virtual bool isRemoteFrameView() const { return false; }
   virtual bool isPluginView() const { return false; }
   virtual bool isPluginContainer() const { return false; }
+  virtual bool isPlaceholder() { return false; }
   virtual bool isScrollbar() const { return false; }
 
   virtual void setParent(FrameViewBase*);
   FrameViewBase* parent() const { return m_parent; }
   FrameViewBase* root() const;
 
   virtual void handleEvent(Event*) {}
 
   IntRect convertToRootFrame(const IntRect&) const;
   IntRect convertFromRootFrame(const IntRect&) const;
@@ skipping 26 matching lines @@
  private:
   Member<FrameViewBase> m_parent;
   IntRect m_frameRect;
   bool m_selfVisible;
   bool m_parentVisible;
 };
 
 }  // namespace blink
 
 #endif  // FrameViewBase_h