[chromecast] Bind and run mojo media services on cma thread.

chromecast/browser/media/cast_mojo_media_client.cc

 // Copyright 2016 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 "chromecast/browser/media/cast_mojo_media_client.h"
 
 #include "chromecast/browser/media/cast_renderer.h"
 
 namespace {
 class CastRendererFactory : public media::RendererFactory {
  public:
   CastRendererFactory(
-      const chromecast::media::CreateMediaPipelineBackendCB& create_backend_cb,
-      const scoped_refptr<media::MediaLog>& media_log)
-      : create_backend_cb_(create_backend_cb), media_log_(media_log) {}
+      base::SingleThreadTaskRunner* media_task_runner,
+      const chromecast::media::CreateMediaPipelineBackendCB& create_backend_cb)
+      : media_task_runner_(media_task_runner),
+        create_backend_cb_(create_backend_cb) {
+    DCHECK(media_task_runner_);
+  }
   ~CastRendererFactory() final {}
 
   scoped_ptr<media::Renderer> CreateRenderer(
       const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
       const scoped_refptr<base::TaskRunner>& worker_task_runner,
       media::AudioRendererSink* audio_renderer_sink,
       media::VideoRendererSink* video_renderer_sink,
       const media::RequestSurfaceCB& request_surface_cb) final {
+    DCHECK_EQ(media_task_runner_, media_task_runner.get());
+    DCHECK_EQ(media_task_runner_, worker_task_runner.get());
     DCHECK(!audio_renderer_sink && !video_renderer_sink);
     return make_scoped_ptr(new chromecast::media::CastRenderer(
         create_backend_cb_, media_task_runner));
   }
 
  private:
+  base::SingleThreadTaskRunner* const media_task_runner_;
   const chromecast::media::CreateMediaPipelineBackendCB create_backend_cb_;
-  scoped_refptr<media::MediaLog> media_log_;
   DISALLOW_COPY_AND_ASSIGN(CastRendererFactory);
 };
 }  // namespace
 
 namespace chromecast {
 namespace media {
 
 CastMojoMediaClient::CastMojoMediaClient(
+    scoped_refptr<base::SingleThreadTaskRunner> media_task_runner,
     const CreateMediaPipelineBackendCB& create_backend_cb)
-    : create_backend_cb_(create_backend_cb) {}
+    : MojoMediaClient(std::move(media_task_runner)),
+      create_backend_cb_(create_backend_cb) {}
 
 CastMojoMediaClient::~CastMojoMediaClient() {}
 
 scoped_ptr<::media::RendererFactory> CastMojoMediaClient::CreateRendererFactory(
     const scoped_refptr<::media::MediaLog>& media_log) {
   return make_scoped_ptr(
-      new CastRendererFactory(create_backend_cb_, media_log));
+      new CastRendererFactory(media_task_runner(), create_backend_cb_));
 }
 
 }  // namespace media
 }  // namespace chromecast