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

content/browser/renderer_host/render_widget_helper.cc

Index: content/browser/renderer_host/render_widget_helper.cc
diff --git a/content/browser/renderer_host/render_widget_helper.cc b/content/browser/renderer_host/render_widget_helper.cc
index 169347f3288462bd4de534d0b12c464ed16ebf70..6d22c2a897b2aebdc53ed8d577bfc3d90ddabf2e 100644
--- a/content/browser/renderer_host/render_widget_helper.cc
+++ b/content/browser/renderer_host/render_widget_helper.cc
@@ -136,6 +136,15 @@ void RenderWidgetHelper::ResumeDeferredNavigation(
                  request_id));
 }
 
+void RenderWidgetHelper::ResumeResponseDeferredAtStart(
+    const GlobalRequestID& request_id) {
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&RenderWidgetHelper::OnResumeResponseDeferredAtStart,
+                 this,
+                 request_id));
+}
+
 bool RenderWidgetHelper::WaitForBackingStoreMsg(
     int render_widget_id, const base::TimeDelta& max_delay, IPC::Message* msg) {
   base::TimeTicks time_start = base::TimeTicks::Now();
@@ -245,6 +254,11 @@ void RenderWidgetHelper::OnResumeDeferredNavigation(
   resource_dispatcher_host_->ResumeDeferredNavigation(request_id);
 }
 
+void RenderWidgetHelper::OnResumeResponseDeferredAtStart(
+    const GlobalRequestID& request_id) {
+  resource_dispatcher_host_->ResumeResponseDeferredAtStart(request_id);
+}
+
 void RenderWidgetHelper::CreateNewWindow(
     const ViewHostMsg_CreateWindow_Params& params,
     bool no_javascript_access,