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

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index bb52683521205948685da4ad3e51949ed4ea9324..0f7ffe31a04374a21f6fc95253fb378a1e48a6af 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -103,6 +103,7 @@
 #include "content/browser/storage_partition_impl.h"
 #include "content/browser/streams/stream_context.h"
 #include "content/browser/tracing/trace_message_filter.h"
+#include "content/browser/transition_request_message_filter.h"
 #include "content/browser/vibration/vibration_message_filter.h"
 #include "content/browser/webui/web_ui_controller_factory_registry.h"
 #include "content/browser/worker_host/worker_message_filter.h"
@@ -834,6 +835,7 @@ void RenderProcessHostImpl::CreateMessageFilters() {
   screen_orientation_dispatcher_host_ = new ScreenOrientationDispatcherHost();
   AddFilter(screen_orientation_dispatcher_host_);
   AddFilter(new PushMessagingMessageFilter());
+  AddFilter(new TransitionRequestMessageFilter(GetID()));
 }
 
 int RenderProcessHostImpl::GetNextRoutingID() {
@@ -846,6 +848,11 @@ void RenderProcessHostImpl::ResumeDeferredNavigation(
   widget_helper_->ResumeDeferredNavigation(request_id);
 }
 
+void RenderProcessHostImpl::ResumeResponseDeferredAtStart(
+    const GlobalRequestID& request_id) {
+  widget_helper_->ResumeResponseDeferredAtStart(request_id);
+}
+
 void RenderProcessHostImpl::NotifyTimezoneChange() {
   Send(new ViewMsg_TimezoneChange());
 }