Add support for Attachment Brokering of IPC::Channels on multiple threads.

remoting/host/win/wts_session_process_delegate.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.
 //
 // This file implements the Windows service controlling Me2Me host processes
 // running within user sessions.
 
 #include "remoting/host/win/wts_session_process_delegate.h"
 
 #include <utility>
@@ skipping 409 matching lines @@
   if (!ResumeThread(worker_thread.Get())) {
     PLOG(ERROR) << "Failed to resume the worker thread";
     ReportFatalError();
     return;
   }
 
   channel_ = std::move(channel);
   pipe_ = std::move(pipe);
 
   IPC::AttachmentBroker::GetGlobal()->RegisterCommunicationChannel(
-      channel_.get());
+      channel_.get(), io_task_runner_);
 
   // Report success if the worker process is lauched directly. Otherwise, PID of
   // the client connected to the pipe will be used later. See
   // OnChannelConnected().
   if (!launch_elevated_)
     ReportProcessLaunched(std::move(worker_process));
 }
 
 void WtsSessionProcessDelegate::Core::DrainJobNotifications() {
   DCHECK(io_task_runner_->BelongsToCurrentThread());
@@ skipping 114 matching lines @@
 
 void WtsSessionProcessDelegate::CloseChannel() {
   core_->CloseChannel();
 }
 
 void WtsSessionProcessDelegate::KillProcess() {
   core_->KillProcess();
 }
 
 }  // namespace remoting