gpu: reference target surfaces through a globally unique surface id.

content/browser/renderer_host/render_message_filter.cc

Index: content/browser/renderer_host/render_message_filter.cc
diff --git a/content/browser/renderer_host/render_message_filter.cc b/content/browser/renderer_host/render_message_filter.cc
index 113fcaeb95c0eb9b1ea37b75f3df23f07a2cfdef..0bcbf6af337fe2dc21a1a3c4fe16e0acc99d71b4 100644
--- a/content/browser/renderer_host/render_message_filter.cc
+++ b/content/browser/renderer_host/render_message_filter.cc
@@ -397,11 +397,14 @@ bool RenderMessageFilter::OffTheRecord() const {
 
 void RenderMessageFilter::OnMsgCreateWindow(
     const ViewHostMsg_CreateWindow_Params& params,
-    int* route_id, int64* cloned_session_storage_namespace_id) {
+    int* route_id,
+    int* surface_id,
+    int64* cloned_session_storage_namespace_id) {
   if (!content::GetContentClient()->browser()->CanCreateWindow(
           GURL(params.opener_security_origin), params.window_container_type,
           resource_context_, render_process_id_)) {
     *route_id = MSG_ROUTING_NONE;
+    *surface_id = 0;
     return;
   }
 
@@ -410,18 +413,23 @@ void RenderMessageFilter::OnMsgCreateWindow(
           params.session_storage_namespace_id);
   render_widget_helper_->CreateNewWindow(params,
                                          peer_handle(),
-                                         route_id);
+                                         route_id,
+                                         surface_id);
 }
 
 void RenderMessageFilter::OnMsgCreateWidget(int opener_id,
                                             WebKit::WebPopupType popup_type,
-                                            int* route_id) {
-  render_widget_helper_->CreateNewWidget(opener_id, popup_type, route_id);
+                                            int* route_id,
+                                            int* surface_id) {
+  render_widget_helper_->CreateNewWidget(
+      opener_id, popup_type, route_id, surface_id);
 }
 
 void RenderMessageFilter::OnMsgCreateFullscreenWidget(int opener_id,
-                                                      int* route_id) {
-  render_widget_helper_->CreateNewFullscreenWidget(opener_id, route_id);
+                                                      int* route_id,
+                                                      int* surface_id) {
+  render_widget_helper_->CreateNewFullscreenWidget(
+      opener_id, route_id, surface_id);
 }
 
 void RenderMessageFilter::OnSetCookie(const IPC::Message& message,