Navigation transitions: Block first response until after transitions have run.

content/browser/frame_host/render_frame_host_delegate.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_RENDER_FRAME_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_DELEGATE_H_
 
 #include "base/basictypes.h"
 #include "base/i18n/rtl.h"
 #include "content/common/content_export.h"
@@ skipping 37 matching lines @@
   // The top-level RenderFrame began loading a new page. This corresponds to
   // Blink's notion of the throbber starting.
   // |to_different_document| will be true unless the load is a fragment
   // navigation, or triggered by history.pushState/replaceState.
   virtual void DidStartLoading(RenderFrameHost* render_frame_host,
                                bool to_different_document) {}
 
   // The RenderFrameHost has been swapped out.
   virtual void SwappedOut(RenderFrameHost* render_frame_host) {}
 
+  // Notification that the navigation on the main frame is blocked waiting
+  // for transition to occur.
+  virtual void DidDeferAfterResponseStarted() {}
+
   // Notification that a worker process has crashed.
   virtual void WorkerCrashed(RenderFrameHost* render_frame_host) {}
 
   // A context menu should be shown, to be built using the context information
   // provided in the supplied params.
   virtual void ShowContextMenu(RenderFrameHost* render_frame_host,
                                const ContextMenuParams& params) {}
 
   // A JavaScript message, confirmation or prompt should be shown.
   virtual void RunJavaScriptMessage(RenderFrameHost* render_frame_host,
@@ skipping 36 matching lines @@
   // not a WebContents, returns NULL.
   virtual WebContents* GetAsWebContents();
 
  protected:
   virtual ~RenderFrameHostDelegate() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_DELEGATE_H_