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

chrome/common/child_thread.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 "chrome/common/child_thread.h"
 
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "base/command_line.h"
 #include "chrome/common/child_process.h"
@@ skipping 25 matching lines @@
   check_with_browser_before_shutdown_ = false;
   on_channel_error_called_ = false;
   message_loop_ = MessageLoop::current();
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kUserAgent)) {
     webkit_glue::SetUserAgent(
         CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
             switches::kUserAgent));
   }
 
   channel_.reset(new IPC::SyncChannel(channel_name_,
-      IPC::Channel::MODE_CLIENT, this, NULL,
+      IPC::Channel::MODE_CLIENT, this,
       ChildProcess::current()->io_message_loop(), true,
       ChildProcess::current()->GetShutDownEvent()));
 #ifdef IPC_MESSAGE_LOG_ENABLED
   IPC::Logging::current()->SetIPCSender(this);
 #endif
 
   resource_dispatcher_.reset(new ResourceDispatcher(this));
   socket_stream_dispatcher_.reset(new SocketStreamDispatcher());
   file_system_dispatcher_.reset(new FileSystemDispatcher());
 
@@ skipping 133 matching lines @@
     MessageLoop::current()->Quit();
     return;
   }
 
   // The child process shutdown sequence is a request response based mechanism,
   // where we send out an initial feeler request to the child process host
   // instance in the browser to verify if it's ok to shutdown the child process.
   // The browser then sends back a response if it's ok to shutdown.
   Send(new PluginProcessHostMsg_ShutdownRequest);
 }