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"
 
@@ skipping 12 matching lines @@
         WebLocalFrame* sourceFrame,
         WebRemoteFrame* targetFrame,
         WebSecurityOrigin targetOrigin,
         WebDOMMessageEvent) { }
 
     // Send initial drawing parameters to a child frame that is being rendered
     // out of process.
     virtual void initializeChildFrame(
         const WebRect& frameRect,
         float scaleFactor) { }
+
+    // A remote frame was asked to start a navigation.
+    virtual void navigate(const WebURLRequest& request, bool shouldReplaceCurrentEntry) { }
 };
 
 } // namespace blink
 
 #endif // WebRemoteFrameClient_h