Add a base class for objects that want to filter messages on the UI thread. ...

chrome/renderer/gpu_channel_host.cc

 // Copyright (c) 2010 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 "chrome/renderer/gpu_channel_host.h"
 
 #include "chrome/common/child_process.h"
 #include "chrome/common/gpu_create_command_buffer_config.h"
 #include "chrome/common/gpu_messages.h"
 #include "chrome/renderer/command_buffer_proxy.h"
 #include "chrome/renderer/gpu_video_service_host.h"
 
 GpuChannelHost::GpuChannelHost() : state_(kUnconnected) {
 }
 
 GpuChannelHost::~GpuChannelHost() {
 }
 
 void GpuChannelHost::Connect(const std::string& channel_name) {
   // Open a channel to the GPU process.
   channel_.reset(new IPC::SyncChannel(
-      channel_name, IPC::Channel::MODE_CLIENT, this, NULL,
+      channel_name, IPC::Channel::MODE_CLIENT, this,
       ChildProcess::current()->io_message_loop(), true,
       ChildProcess::current()->GetShutDownEvent()));
 
   // It is safe to send IPC messages before the channel completes the connection
   // and receives the hello message from the GPU process. The messages get
   // cached.
   state_ = kConnected;
 }
 
 void GpuChannelHost::set_gpu_info(const GPUInfo& gpu_info) {
@@ skipping 121 matching lines @@
   // Check the proxy has not already been removed after a channel error.
   int route_id = command_buffer->route_id();
   if (proxies_.find(command_buffer->route_id()) != proxies_.end()) {
     proxies_.erase(route_id);
     router_.RemoveRoute(route_id);
   }
 
   delete command_buffer;
 #endif
 }