Plumb changes to the focused frame to WebFramelient.

public/web/WebFrameClient.h

 /*
  * Copyright (C) 2011, 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 112 matching lines @@
     // frameDetached().
     virtual WebFrame* createChildFrame(WebFrame* parent, const WebString& frameName) { return 0; }
 
     // This frame set its opener to null, disowning it.
     // See http://html.spec.whatwg.org/#dom-opener.
     virtual void didDisownOpener(WebFrame*) { }
 
     // This frame has been detached from the view, but has not been closed yet.
     virtual void frameDetached(WebFrame*) { }
 
+    // This frame has become focused..
+    virtual void frameFocused() { }
+
     // This frame is about to be closed. This is called after frameDetached,
     // when the document is being unloaded, due to new one committing.
     virtual void willClose(WebFrame*) { }
 
     // This frame's name has changed.
     virtual void didChangeName(WebFrame*, const WebString&) { }
 
     // Called when a watched CSS selector matches or stops matching.
     virtual void didMatchCSS(WebFrame*, const WebVector<WebString>& newlyMatchingSelectors, const WebVector<WebString>& stoppedMatchingSelectors) { }
 
@@ skipping 246 matching lines @@
     // Send initial drawing parameters to a child frame that is being rendered out of process.
     virtual void initializeChildFrame(const WebRect& frameRect, float scaleFactor) { }
 
 protected:
     ~WebFrameClient() { }
 };
 
 } // namespace blink
 
 #endif