Make attachment broker a subclass of IPC::Listener.

content/child/child_thread_impl.cc

 // Copyright (c) 2012 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/child/child_thread_impl.h"
 
 #include <signal.h>
 
 #include <string>
 
@@ skipping 593 matching lines @@
   if (mojo_application_->OnMessageReceived(msg))
     return true;
 
   // Resource responses are sent to the resource dispatcher.
   if (resource_dispatcher_->OnMessageReceived(msg))
     return true;
   if (websocket_dispatcher_->OnMessageReceived(msg))
     return true;
   if (file_system_dispatcher_->OnMessageReceived(msg))
     return true;
+  if (attachment_broker_ && attachment_broker_->OnMessageReceived(msg))
+    return true;
 
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ChildThreadImpl, msg)
     IPC_MESSAGE_HANDLER(ChildProcessMsg_Shutdown, OnShutdown)
 #if defined(IPC_MESSAGE_LOG_ENABLED)
     IPC_MESSAGE_HANDLER(ChildProcessMsg_SetIPCLoggingEnabled,
                         OnSetIPCLoggingEnabled)
 #endif
     IPC_MESSAGE_HANDLER(ChildProcessMsg_SetProfilerStatus,
                         OnSetProfilerStatus)
@@ skipping 102 matching lines @@
 
 void ChildThreadImpl::OnProcessBackgrounded(bool background) {
   // Set timer slack to maximum on main thread when in background.
   base::TimerSlack timer_slack = base::TIMER_SLACK_NONE;
   if (background)
     timer_slack = base::TIMER_SLACK_MAXIMUM;
   base::MessageLoop::current()->SetTimerSlack(timer_slack);
 }
 
 }  // namespace content