Give the main frame a RenderWidget.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index f7505af877b67c2644609a9ff6920d39dfba84a0..a16eafd1e2102f6ae53bf94b6a84c06006bcec38 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1646,8 +1646,9 @@ void WebContentsImpl::LostMouseLock() {
 
 void WebContentsImpl::CreateNewWindow(
     SiteInstance* source_site_instance,
-    int route_id,
-    int main_frame_route_id,
+    int32 route_id,
+    int32 main_frame_route_id,
+    int32 main_frame_widget_route_id,
     const ViewHostMsg_CreateWindow_Params& params,
     SessionStorageNamespace* session_storage_namespace) {
   // We usually create the new window in the same BrowsingInstance (group of
@@ -1706,14 +1707,10 @@ void WebContentsImpl::CreateNewWindow(
   CHECK(session_storage_namespace_impl->IsFromContext(dom_storage_context));
 
   if (delegate_ &&
-      !delegate_->ShouldCreateWebContents(this,
-                                          route_id,
-                                          main_frame_route_id,
-                                          params.window_container_type,
-                                          params.frame_name,
-                                          params.target_url,
-                                          partition_id,
-                                          session_storage_namespace)) {
+      !delegate_->ShouldCreateWebContents(
+          this, route_id, main_frame_route_id, main_frame_widget_route_id,
+          params.window_container_type, params.frame_name, params.target_url,
+          partition_id, session_storage_namespace)) {
     if (route_id != MSG_ROUTING_NONE &&
         !RenderViewHost::FromID(render_process_id, route_id)) {
       // If the embedder didn't create a WebContents for this route, we need to
@@ -1723,6 +1720,8 @@ void WebContentsImpl::CreateNewWindow(
     GetRenderViewHost()->GetProcess()->ResumeRequestsForView(route_id);
     GetRenderViewHost()->GetProcess()->ResumeRequestsForView(
         main_frame_route_id);
+    GetRenderViewHost()->GetProcess()->ResumeRequestsForView(
+        main_frame_widget_route_id);
     return;
   }
 
@@ -1731,6 +1730,7 @@ void WebContentsImpl::CreateNewWindow(
   CreateParams create_params(GetBrowserContext(), site_instance.get());
   create_params.routing_id = route_id;
   create_params.main_frame_routing_id = main_frame_route_id;
+  create_params.main_frame_widget_routing_id = main_frame_widget_route_id;
   create_params.main_frame_name = params.frame_name;
   create_params.opener_render_process_id = render_process_id;
   create_params.opener_render_frame_id = params.opener_render_frame_id;