Give the main frame a RenderWidget.

content/public/test/render_view_test.cc

Index: content/public/test/render_view_test.cc
diff --git a/content/public/test/render_view_test.cc b/content/public/test/render_view_test.cc
index daa4a445c8f92a19c305f367fab8a943b050f917..113328160e59d3ba8414fb6711dc264354abb61f 100644
--- a/content/public/test/render_view_test.cc
+++ b/content/public/test/render_view_test.cc
@@ -61,6 +61,7 @@ namespace {
 
 const int32 kRouteId = 5;
 const int32 kMainFrameRouteId = 6;
+const int32 kMainFrameWidgetRouteId = 8;
 const int32 kNewWindowRouteId = 7;
 const int32 kNewFrameRouteId = 10;
 const int32 kSurfaceId = 42;
@@ -209,6 +210,8 @@ void RenderViewTest::SetUp() {
   render_thread_->set_routing_id(kRouteId);
   render_thread_->set_surface_id(kSurfaceId);
   render_thread_->set_new_window_routing_id(kNewWindowRouteId);
+  render_thread_->set_new_window_main_frame_widget_routing_id(
+      kMainFrameWidgetRouteId);
   render_thread_->set_new_frame_routing_id(kNewFrameRouteId);
 
 #if defined(OS_MACOSX)
@@ -245,9 +248,11 @@ void RenderViewTest::SetUp() {
   view_params.renderer_preferences = RendererPreferences();
   view_params.web_preferences = WebPreferences();
   view_params.view_id = kRouteId;
+  view_params.view_surface_id = kSurfaceId;
   view_params.main_frame_routing_id = kMainFrameRouteId;
-  view_params.surface_id = kSurfaceId;
+  view_params.main_frame_widget_routing_id = kMainFrameWidgetRouteId;
   view_params.session_storage_namespace_id = kInvalidSessionStorageNamespaceId;
+  view_params.widget_surface_id = kSurfaceId + 1;

[ncarter (slow), 2015/09/03 20:24:37]

Same question here: how much of a hack is this? Can it break?

[dcheng, 2015/09/03 21:29:24]

Same.

   view_params.swapped_out = false;
   view_params.replicated_frame_state = FrameReplicationState();
   view_params.proxy_routing_id = MSG_ROUTING_NONE;