Implement sequential focus navigation for OOPIF.

third_party/WebKit/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/platform/WebFocusType.h"
 #include "public/platform/WebSecurityOrigin.h"
 #include "public/web/WebDOMMessageEvent.h"
 
 namespace blink {
 class WebInputEvent;
 class WebLocalFrame;
 class WebRemoteFrame;
 struct WebRect;
 
 class WebRemoteFrameClient {
@@ skipping 23 matching lines @@
     virtual void reload(bool ignoreCache, bool isClientRedirect) { }
 
     // FIXME: Remove this method once we have input routing in the browser
     // process. See http://crbug.com/339659.
     virtual void forwardInputEvent(const WebInputEvent*) { }
 
     virtual void frameRectsChanged(const WebRect&) { }
 
     // This frame updated its opener to another frame.
     virtual void didChangeOpener(WebFrame* opener) { }
+
+    // Continue sequential focus navigation in this frame.  This is called when
+    // the |source| frame is searching for the next focusable element (e.g., in
+    // response to <tab>) and encounters a remote frame.
+    virtual void advanceFocus(WebFocusType type, WebLocalFrame* source) { }
 };
 
 } // namespace blink
 
 #endif // WebRemoteFrameClient_h