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

content/browser/frame_host/navigator.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_NAVIGATOR_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_controller.h"
@@ skipping 16 matching lines @@
 
 // Implementations of this interface are responsible for performing navigations
 // in a node of the FrameTree. Its lifetime is bound to all FrameTreeNode
 // objects that are using it and will be released once all nodes that use it are
 // freed. The Navigator is bound to a single frame tree and cannot be used by
 // multiple instances of FrameTree.
 // TODO(nasko): Move all navigation methods, such as didStartProvisionalLoad
 // from WebContentsImpl to this interface.
 class CONTENT_EXPORT Navigator : public base::RefCounted<Navigator> {
  public:
+  // Returns the NavigationController associated with this Navigator.
+  virtual NavigationController* GetController();

[Charlie Reis, 2014/04/24 23:17:50]

We should probably implement this in InterstitialPageNavigatorImpl as well, to
head off bugs for future callers of this.

[nasko, 2014/04/24 23:29:34]

Done.

+
   // The RenderFrameHostImpl started a provisional load.
   virtual void DidStartProvisionalLoad(RenderFrameHostImpl* render_frame_host,
                                        int parent_routing_id,
                                        const GURL& url) {};
 
   // The RenderFrameHostImpl has failed a provisional load.
   virtual void DidFailProvisionalLoadWithError(
       RenderFrameHostImpl* render_frame_host,
       const FrameHostMsg_DidFailProvisionalLoadWithError_Params& params) {};
 
@@ skipping 64 matching lines @@
       bool user_gesture) {}
 
  protected:
   friend class base::RefCounted<Navigator>;
   virtual ~Navigator() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_H_