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

chrome/common/plugin_messages_internal.h

 // 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/shared_memory.h"
 #include "build/build_config.h"
 #include "gfx/native_widget_types.h"
 #include "ipc/ipc_message_macros.h"
 #include "webkit/glue/webcursor.h"
 
@@ skipping 420 matching lines @@
   // IOSurface object of the given width and height. This information is then
   // forwarded on to the browser process.
   //
   // NOTE: the original intent was to pass a mach port as the IOSurface
   // identifier but it looks like that will be a lot of work. For now we pass an
   // ID from IOSurfaceGetID.
   IPC_MESSAGE_ROUTED4(PluginHostMsg_AcceleratedSurfaceSetIOSurface,
                       gfx::PluginWindowHandle /* window */,
                       int32 /* width */,
                       int32 /* height */,
-                      uint64 /* identifier for IOSurface */)
+                      uint64 /* surface_id */)
 
 
   // On the Mac, shared memory can't be allocated in the sandbox, so
   // the TransportDIB used by the plug-in for rendering has to be allocated
   // and managed by the browser.  This is a synchronous message, use with care.
   IPC_SYNC_MESSAGE_ROUTED1_1(PluginHostMsg_AllocTransportDIB,
                              size_t /* requested memory size */,
                              TransportDIB::Handle /* output: DIB handle */)
 
   // Since the browser keeps handles to the allocated transport DIBs, this
   // message is sent to tell the browser that it may release them when the
   // renderer is finished with them.
   IPC_MESSAGE_ROUTED1(PluginHostMsg_FreeTransportDIB,
                       TransportDIB::Id /* DIB id */)
 
   // This message notifies the renderer process (and from there the
   // browser process) that the plug-in swapped the buffers associated
   // with the given "window", which should cause the browser to redraw
   // the various plug-ins' contents.
-  IPC_MESSAGE_ROUTED1(PluginHostMsg_AcceleratedSurfaceBuffersSwapped,
-                      gfx::PluginWindowHandle /* window */)
+  IPC_MESSAGE_ROUTED2(PluginHostMsg_AcceleratedSurfaceBuffersSwapped,
+                      gfx::PluginWindowHandle /* window */,
+                      uint64 /* surface_id */)
 #endif
 
 IPC_END_MESSAGES(PluginHost)
 
 //-----------------------------------------------------------------------------
 // NPObject messages
 // These are messages used to marshall NPObjects.  They are sent both from the
 // plugin to the renderer and from the renderer to the plugin.
 IPC_BEGIN_MESSAGES(NPObject)
   IPC_SYNC_MESSAGE_ROUTED0_0(NPObjectMsg_Release)
@@ skipping 38 matching lines @@
                              NPVariant_Param /* result_param */,
                              bool /* result */)
 
   IPC_SYNC_MESSAGE_ROUTED2_2(NPObjectMsg_Evaluate,
                              std::string /* script */,
                              bool /* popups_allowed */,
                              NPVariant_Param /* result_param */,
                              bool /* result */)
 
 IPC_END_MESSAGES(NPObject)