Merge 87743

Source/WebCore/html/shadow/MediaControls.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2011 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 55 matching lines @@
     virtual void changedClosedCaptionsVisibility() = 0;
 
     virtual void showVolumeSlider() = 0;
     virtual void updateTimeDisplay() = 0;
 
 protected:
     MediaControls(HTMLMediaElement*);
 
 private:
     MediaControls();
+
+    virtual bool isMediaControls() const { return true; }
 };
 
+inline MediaControls* toMediaControls(Node* node)
+{
+    ASSERT(!node || node->isMediaControls());
+    return static_cast<MediaControls*>(node);
+}
+
+// This will catch anyone doing an unneccessary cast.
+void toMediaControls(const Node*);
+
 }
 
 #endif
 
 #endif