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

content/browser/renderer_host/render_widget_helper.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_helper.h"
 
 #include "base/eintr_wrapper.h"
 #include "base/threading/thread.h"
 #include "content/browser/browser_thread.h"
 #include "content/browser/renderer_host/render_process_host.h"
@@ skipping 315 matching lines @@
 void RenderWidgetHelper::ClearAllocatedDIBs() {
   for (std::map<TransportDIB::Id, int>::iterator
        i = allocated_dibs_.begin(); i != allocated_dibs_.end(); ++i) {
     if (HANDLE_EINTR(close(i->second)) < 0)
       PLOG(ERROR) << "close: " << i->first;
   }
 
   allocated_dibs_.clear();
 }
 #endif
+
+void RenderWidgetHelper::SetCompositingSurface(
+    int render_widget_id,
+    gfx::PluginWindowHandle compositing_surface) {
+  base::AutoLock locked(view_compositing_surface_map_lock_);
+  if (compositing_surface != gfx::kNullPluginWindow)
+    view_compositing_surface_map_[render_widget_id] = compositing_surface;
+  else
+    view_compositing_surface_map_.erase(render_widget_id);
+}
+
+gfx::PluginWindowHandle RenderWidgetHelper::LookupCompositingSurface(
+    int render_widget_id) {
+  base::AutoLock locked(view_compositing_surface_map_lock_);
+  ViewCompositingSurfaceMap::iterator it =
+      view_compositing_surface_map_.find(render_widget_id);
+  if (it == view_compositing_surface_map_.end())
+    return gfx::kNullPluginWindow;
+
+  return it->second;
+}