LTTF: Implement WebFrameLoaderClient::dispatchUnableToImplementPolicy() and so on

webkit/api/public/WebFrameClient.h

Index: webkit/api/public/WebFrameClient.h
===================================================================
--- webkit/api/public/WebFrameClient.h	(revision 29248)
+++ webkit/api/public/WebFrameClient.h	(working copy)
@@ -91,7 +91,17 @@
             const WebNode& originatingNode,
             WebNavigationPolicy defaultPolicy, bool isRedirect) = 0;
 
+        // Query if the specified request can be handled.
+        virtual bool canHandleRequest(const WebURLRequest& request) = 0;
 
+        // Called if canHandledRequest() returns false.
+        virtual WebURLError cannotShowURLError(
+            const WebURLRequest& request) = 0;
+
+        // Notify that a URL cannot be handled.
+        virtual void unableToImplementPolicyWithError(
+            WebFrame*, const WebURLError&) = 0;
+
         // Navigational notifications ------------------------------------------
 
         // A form submission is about to occur.