Add a WebDocument::watchCssSelectors(selectors)

Source/core/loader/FrameLoaderClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 131 matching lines @@
         // insecure source.  Inactive content cannot spread to other frames.
         virtual void didDisplayInsecureContent() = 0;
 
         // The indicated security origin has run active content (such as a
         // script) from an insecure source.  Note that the insecure content can
         // spread to other frames in the same origin.
         virtual void didRunInsecureContent(SecurityOrigin*, const KURL&) = 0;
         virtual void didDetectXSS(const KURL&, bool didBlockEntirePage) = 0;
         virtual void didDispatchPingLoader(const KURL&) = 0;
 
+        // Transmits the change in the set of watched CSS selectors property
+        // that match any element on the frame.
+        virtual void selectorMatchChanged(const Vector<String>& addedSelectors, const Vector<String>& removedSelectors) = 0;
+
         virtual PassRefPtr<DocumentLoader> createDocumentLoader(const ResourceRequest&, const SubstituteData&) = 0;
 
         virtual String userAgent(const KURL&) = 0;
 
         virtual String doNotTrackValue() = 0;
 
         virtual void transitionToCommittedForNewPage() = 0;
 
         virtual PassRefPtr<Frame> createFrame(const KURL&, const String& name, const String& referrer, HTMLFrameOwnerElement*) = 0;
         virtual PassRefPtr<Widget> createPlugin(const IntSize&, HTMLPlugInElement*, const KURL&, const Vector<String>&, const Vector<String>&, const String&, bool loadManually) = 0;
@@ skipping 53 matching lines @@
         virtual void dispatchDidChangeResourcePriority(unsigned long /*identifier*/, ResourceLoadPriority) { }
 
         virtual WebKit::WebServiceWorkerRegistry* serviceWorkerRegistry() = 0;
 
         virtual void didStopAllLoaders() { }
     };
 
 } // namespace WebCore
 
 #endif // FrameLoaderClient_h