Merge 87743

Source/WebCore/html/shadow/MediaControls.h

Index: Source/WebCore/html/shadow/MediaControls.h
===================================================================
--- Source/WebCore/html/shadow/MediaControls.h	(revision 87760)
+++ Source/WebCore/html/shadow/MediaControls.h	(working copy)
@@ -73,10 +73,21 @@
 
 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