Add a mojo implementation of AudioOutputIPC.

content/renderer/render_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/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 683 matching lines @@
   peer_connection_factory_.reset(
       new PeerConnectionDependencyFactory(p2p_socket_dispatcher_.get()));
 
   aec_dump_message_filter_ = new AecDumpMessageFilter(
       GetIOTaskRunner(), message_loop()->task_runner());
 
   AddFilter(aec_dump_message_filter_.get());
 
 #endif  // BUILDFLAG(ENABLE_WEBRTC)
 
+  audio_message_filter_ = new AudioMessageFilter(GetIOTaskRunner());
+  AddFilter(audio_message_filter_.get());
+
   audio_input_message_filter_ = new AudioInputMessageFilter(GetIOTaskRunner());
   AddFilter(audio_input_message_filter_.get());
 
-  audio_message_filter_ = new AudioMessageFilter(GetIOTaskRunner());
-  AddFilter(audio_message_filter_.get());
+  audio_ipc_factory_.emplace(GetIOTaskRunner(), audio_message_filter_.get());

[o1ka, 2017/05/11 10:58:41]

Make it own |audio_message_filter_|? And remove audio_message_filter() getter
from renderer thread?

[Max Morin, 2017/05/11 15:31:18]

Done. Now AudioMessageFilter is completely cannibalized :).

 
   midi_message_filter_ = new MidiMessageFilter(GetIOTaskRunner());
   AddFilter(midi_message_filter_.get());
 
   AddFilter((new CacheStorageMessageFilter(thread_safe_sender()))->GetFilter());
 
   AddFilter((new ServiceWorkerContextMessageFilter())->GetFilter());
 
 #if defined(USE_AURA)
   if (IsRunningInMash()) {
@@ skipping 1716 matching lines @@
   }
 }
 
 void RenderThreadImpl::OnRendererInterfaceRequest(
     mojom::RendererAssociatedRequest request) {
   DCHECK(!renderer_binding_.is_bound());
   renderer_binding_.Bind(std::move(request));
 }
 
 }  // namespace content