GPU compositing surface handle is no longer sent to renderer process.

content/browser/renderer_host/render_widget_host.cc

Index: content/browser/renderer_host/render_widget_host.cc
===================================================================
--- content/browser/renderer_host/render_widget_host.cc	(revision 89036)
+++ content/browser/renderer_host/render_widget_host.cc	(working copy)
@@ -100,12 +100,21 @@
 }
 
 RenderWidgetHost::~RenderWidgetHost() {
+  set_view(NULL);
+
   // Clear our current or cached backing store if either remains.
   BackingStoreManager::RemoveBackingStore(this);
 
   process_->Release(routing_id_);
 }
 
+void RenderWidgetHost::set_view(RenderWidgetHostView* view) {
+  view_ = view;
+
+  if (!view_)
+    process_->SetCompositingSurface(routing_id_, gfx::kNullPluginWindow);
+}
+
 gfx::NativeViewId RenderWidgetHost::GetNativeViewId() {
   if (view_)
     return gfx::IdFromNativeView(view_->GetNativeView());
@@ -129,9 +138,11 @@
 
   renderer_initialized_ = true;
 
+  process_->SetCompositingSurface(routing_id_,
+                                  GetCompositingSurface());
+
   // Send the ack along with the information on placement.
-  Send(new ViewMsg_CreatingNew_ACK(
-      routing_id_, GetNativeViewId(), GetCompositingSurface()));
+  Send(new ViewMsg_CreatingNew_ACK(routing_id_, GetNativeViewId()));
   WasResized();
 }
 
@@ -365,7 +376,7 @@
 void RenderWidgetHost::ViewDestroyed() {
   // TODO(evanm): tracking this may no longer be necessary;
   // eliminate this function if so.
-  view_ = NULL;
+  set_view(NULL);
 }
 
 void RenderWidgetHost::SetIsLoading(bool is_loading) {