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 29 matching lines @@
 // and use it to replace this class.
 class PLATFORM_EXPORT FrameViewBase : public GarbageCollectedMixin {
  public:
   FrameViewBase(){};
   virtual ~FrameViewBase(){};
 
   virtual IntPoint Location() const = 0;
 
   virtual bool IsFrameView() const { return false; }
   virtual bool IsRemoteFrameView() const { return false; }
+  virtual bool IsErrorplaceholder() { return false; }
 
   virtual void SetParent(FrameViewBase*) = 0;
   virtual FrameViewBase* Parent() const = 0;
 
   // TODO(joelhockey): Remove this from FrameViewBase once FrameView children
   // use FrameOrPlugin rather than FrameViewBase.  This method does not apply to
   // scrollbars.
   virtual void SetParentVisible(bool visible) {}
 
   // ConvertFromRootFrame must be in FrameViewBase rather than FrameView
@@ skipping 53 matching lines @@
   }
 
   virtual void FrameRectsChanged() { NOTREACHED(); }
 
   virtual void Dispose() {}
 };
 
 }  // namespace blink
 
 #endif  // FrameViewBase_h