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

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index a0be1cf20a767c45a6879480478f803a08432735..14b7a5985130512f65753caf5eabc350bec26bae 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -245,6 +245,10 @@ class CONTENT_EXPORT RenderProcessHostImpl
     ConnectTo(service_name, pipe.handle1.Pass());
   }
 
+  // Call this function to resume the navigation when it was deferred
+  // immediately after receiving response headers.
+  void ResumeResponseDeferredAtStart(const GlobalRequestID& request_id);
+
  protected:
   // A proxy for our IPC::Channel that lives on the IO thread (see
   // browser_process.h)