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

ipc/attachment_broker_privileged_win_unittest.cc

 // Copyright 2015 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 "build/build_config.h"
 
 #include <windows.h>
 
 #include <tuple>
 
@@ skipping 488 matching lines @@
 int CommonPrivilegedProcessMain(OnMessageReceivedCallback callback,
                                 const char* channel_name) {
   LOG(INFO) << "Privileged process start.";
   base::MessageLoopForIO main_message_loop;
   ProxyListener listener;
 
   // Set up IPC channel.
   IPC::AttachmentBrokerPrivilegedWin broker;
   scoped_ptr<IPC::Channel> channel(IPC::Channel::CreateClient(
       IPCTestBase::GetChannelName(channel_name), &listener));
-  broker.RegisterCommunicationChannel(channel.get());
+  broker.RegisterCommunicationChannel(channel.get(), nullptr);
   CHECK(channel->Connect());
 
   while (true) {
     LOG(INFO) << "Privileged process spinning run loop.";
     base::MessageLoop::current()->Run();
     ProxyListener::Reason reason = listener.get_reason();
     if (reason == ProxyListener::CHANNEL_ERROR)
       break;
 
     while (listener.has_message()) {
@@ skipping 125 matching lines @@
       memcmp(shared_memory->memory(), kDataBuffer, strlen(kDataBuffer)) == 0;
   SendControlMessage(sender, success);
 }
 
 MULTIPROCESS_IPC_TEST_CLIENT_MAIN(SendSharedMemoryHandle) {
   return CommonPrivilegedProcessMain(&SendSharedMemoryHandleCallback,
                                      "SendSharedMemoryHandle");
 }
 
 }  // namespace