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

content/browser/renderer_host/render_widget_helper.h

 // Copyright (c) 2012 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_RENDERER_HOST_RENDER_WIDGET_HELPER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HELPER_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 107 matching lines @@
 
   // IO THREAD ONLY -----------------------------------------------------------
 
   // Lookup the RenderWidgetHelper from the render_process_host_id. Returns NULL
   // if not found. NOTE: The raw pointer is for temporary use only. To retain,
   // store in a scoped_refptr.
   static RenderWidgetHelper* FromProcessHostID(int render_process_host_id);
 
   // UI THREAD ONLY -----------------------------------------------------------
 
-  // These three functions provide the backend implementation of the
+  // These four functions provide the backend implementation of the
   // corresponding functions in RenderProcessHost. See those declarations
   // for documentation.
   void ResumeDeferredNavigation(const GlobalRequestID& request_id);
+  void ResumeResponseDeferredAtStart(const GlobalRequestID& request_id);
   bool WaitForBackingStoreMsg(int render_widget_id,
                               const base::TimeDelta& max_delay,
                               IPC::Message* msg);
   // Called to resume the requests for a view after it's ready. The view was
   // created by CreateNewWindow which initially blocked the requests.
   void ResumeRequestsForView(int route_id);
 
   // IO THREAD ONLY -----------------------------------------------------------
 
   // Called on the IO thread when a BackingStore message is received.
@@ skipping 70 matching lines @@
                           int route_id,
                           blink::WebPopupType popup_type);
 
   // Called on the UI thread to create a fullscreen widget.
   void OnCreateFullscreenWidgetOnUI(int opener_id, int route_id);
 
   // Called on the IO thread to resume a paused navigation in the network
   // stack without transferring it to a new renderer process.
   void OnResumeDeferredNavigation(const GlobalRequestID& request_id);
 
+  // Called on the IO thread to resume a navigation paused immediately after
+  // receiving response headers.
+  void OnResumeResponseDeferredAtStart(const GlobalRequestID& request_id);
+
 #if defined(OS_POSIX)
   // Called on destruction to release all allocated transport DIBs
   void ClearAllocatedDIBs();
 
   // On POSIX we keep file descriptors to all the allocated DIBs around until
   // the renderer frees them.
   base::Lock allocated_dibs_lock_;
   std::map<TransportDIB::Id, int> allocated_dibs_;
 #endif
 
@@ skipping 13 matching lines @@
   base::AtomicSequenceNumber next_routing_id_;
 
   ResourceDispatcherHostImpl* resource_dispatcher_host_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HELPER_H_