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

content/browser/renderer_host/render_widget_helper.h

Index: content/browser/renderer_host/render_widget_helper.h
===================================================================
--- content/browser/renderer_host/render_widget_helper.h	(revision 90090)
+++ content/browser/renderer_host/render_widget_helper.h	(working copy)
@@ -16,6 +16,7 @@
 #include "base/synchronization/waitable_event.h"
 #include "content/common/window_container_type.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPopupType.h"
+#include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/surface/transport_dib.h"
 
 namespace IPC {
@@ -117,6 +118,10 @@
   TransportDIB* MapTransportDIB(TransportDIB::Id dib_id);
 #endif
 
+  // Set a mapping from a RenderWidgetHost to a compositing surface. Pass a null
+  // handle to remove the mapping.
+  void SetCompositingSurface(int render_widget_id,
+                             gfx::PluginWindowHandle compositing_surface);
 
   // IO THREAD ONLY -----------------------------------------------------------
 
@@ -145,6 +150,9 @@
   void FreeTransportDIB(TransportDIB::Id dib_id);
 #endif
 
+  // Lookup the compositing surface corresponding to a widget ID.
+  gfx::PluginWindowHandle LookupCompositingSurface(int render_widget_id);
+
  private:
   // A class used to proxy a paint message.  PaintMsgProxy objects are created
   // on the IO thread and destroyed on the UI thread.
@@ -200,6 +208,11 @@
   UpdateMsgProxyMap pending_paints_;
   base::Lock pending_paints_lock_;
 
+  // Maps from view ID to compositing surface.
+  typedef std::map<int, gfx::PluginWindowHandle> ViewCompositingSurfaceMap;
+  ViewCompositingSurfaceMap view_compositing_surface_map_;
+  base::Lock view_compositing_surface_map_lock_;
+
   int render_process_id_;
 
   // Event used to implement WaitForUpdateMsg.