Let every "accelerated IO surface swapped" message have an identifier of the surface.

chrome/plugin/command_buffer_stub.cc

 // Copyright (c) 2009 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 "base/callback.h"
 #include "base/scoped_open_process.h"
 #include "base/shared_memory.h"
 #include "chrome/common/gpu_messages.h"
 #include "chrome/common/plugin_messages.h"
 #include "chrome/plugin/command_buffer_stub.h"
@@ skipping 208 matching lines @@
       notify_repaint = true;
     }
   }
   if (notify_repaint) {
     // Indicate to the client that at least one repaint is needed.
     NotifyRepaint();
   }
 }
 
 void CommandBufferStub::SwapBuffersCallback() {
-  Send(new PluginHostMsg_AcceleratedSurfaceBuffersSwapped(plugin_host_route_id_,
-                                                          window_));
+  Send(new PluginHostMsg_AcceleratedSurfaceBuffersSwapped(
+      plugin_host_route_id_, window_, processor_->GetSurfaceId()));
 }
 
 void CommandBufferStub::AllocTransportDIB(const size_t size,
                                           TransportDIB::Handle* dib_handle) {
   Send(new PluginHostMsg_AllocTransportDIB(plugin_host_route_id_,
                                            size,
                                            dib_handle));
 }
 
 void CommandBufferStub::FreeTransportDIB(TransportDIB::Id dib_id) {
   Send(new PluginHostMsg_FreeTransportDIB(plugin_host_route_id_,
                                           dib_id));
 }
 #endif