Perform navigation policy check on UI thread for --site-per-process.

content/browser/frame_host/interstitial_page_navigator_impl.h

 // Copyright 2013 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 CONTENT_BROWSER_FRAME_HOST_INTERSTITIAL_PAGE_NAVIGATOR_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_INTERSTITIAL_PAGE_NAVIGATOR_IMPL_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/browser/frame_host/navigator.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 class NavigationControllerImpl;
 class InterstitialPageImpl;
 
 // Navigator implementation specific to InterstialPageImpl. It allows only one
 // navigation to commit, since interstitial pages are not allowed to navigate.
 class CONTENT_EXPORT InterstitialPageNavigatorImpl : public Navigator {
  public:
   InterstitialPageNavigatorImpl(
       InterstitialPageImpl* interstitial,
       NavigationControllerImpl* navigation_controller);
 
+  virtual NavigationController* GetController() OVERRIDE;
   virtual void DidNavigate(
       RenderFrameHostImpl* render_frame_host,
       const FrameHostMsg_DidCommitProvisionalLoad_Params&
           input_params) OVERRIDE;
 
  private:
   virtual ~InterstitialPageNavigatorImpl() {}
 
   // The InterstitialPage with which this navigator object is associated.
   // Non owned pointer.
   InterstitialPageImpl* interstitial_;
 
+  // The NavigationController associated with this navigator.
+  NavigationControllerImpl* controller_;
+
   DISALLOW_COPY_AND_ASSIGN(InterstitialPageNavigatorImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_INTERSTITIAL_PAGE_NAVIGATOR_IMPL_H_