Plumbing toward transitioning remote frame back to a local frame.

public/web/WebRemoteFrameClient.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebRemoteFrameClient_h
 #define WebRemoteFrameClient_h
 
 #include "public/web/WebDOMMessageEvent.h"
 #include "public/web/WebSecurityOrigin.h"
 
 namespace blink {
 class WebLocalFrame;
 class WebRemoteFrame;
 
 class WebRemoteFrameClient {
 public:
     // Notifies the embedder that a postMessage was issued to a remote frame.
     virtual void postMessageEvent(
         WebLocalFrame* sourceFrame,
         WebRemoteFrame* targetFrame,
         WebSecurityOrigin targetOrigin,
         WebDOMMessageEvent) = 0;
+
+    // A remote frame was asked to start a navigation.
+    virtual void navigate(WebRemoteFrame* frame, const WebURLRequest& request,
+        bool shouldReplaceCurrentEntry) { }
 };
 
 } // namespace blink
 
 #endif // WebRemoteFrameClient_h