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

content/browser/loader/resource_dispatcher_host_impl.cc

Index: content/browser/loader/resource_dispatcher_host_impl.cc
diff --git a/content/browser/loader/resource_dispatcher_host_impl.cc b/content/browser/loader/resource_dispatcher_host_impl.cc
index 09644d64cce082426ca5c8ae0c9124d6d51b02ce..d342ec3c84d389dd0e5563a048a1a4be21813b14 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.cc
+++ b/content/browser/loader/resource_dispatcher_host_impl.cc
@@ -387,6 +387,17 @@ void ResourceDispatcherHostImpl::RemoveResourceContext(
   active_resource_contexts_.erase(context);
 }
 
+void ResourceDispatcherHostImpl::ResumeResponseDeferredAtStart(
+    const GlobalRequestID& id) {
+  ResourceLoader* loader = GetLoader(id);
+  if (loader) {
+    // The response we were meant to resume could have already been canceled.
+    ResourceRequestInfoImpl* info = loader->GetRequestInfo();
+    if (info->cross_site_handler())
+      info->cross_site_handler()->ResumeResponseDeferredAtStart(id.request_id);
+  }
+}
+
 void ResourceDispatcherHostImpl::CancelRequestsForContext(
     ResourceContext* context) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));