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

media/mojo/services/android_mojo_media_client.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 "media/mojo/services/android_mojo_media_client.h"
 
 #include "media/base/android/android_cdm_factory.h"
 #include "media/filters/android/media_codec_audio_decoder.h"
 #include "media/mojo/interfaces/provision_fetcher.mojom.h"
 #include "media/mojo/services/mojo_provision_fetcher.h"
 #include "mojo/shell/public/cpp/connect.h"
 
 namespace media {
 
 namespace {
 
 scoped_ptr<ProvisionFetcher> CreateProvisionFetcher(
     mojo::shell::mojom::InterfaceProvider* interface_provider) {
   interfaces::ProvisionFetcherPtr provision_fetcher_ptr;
   mojo::GetInterface(interface_provider, &provision_fetcher_ptr);
   return make_scoped_ptr(
       new MojoProvisionFetcher(std::move(provision_fetcher_ptr)));
 }
 
 }  // namespace
 
-AndroidMojoMediaClient::AndroidMojoMediaClient() {}
+AndroidMojoMediaClient::AndroidMojoMediaClient() : MojoMediaClient(nullptr) {}
 
 AndroidMojoMediaClient::~AndroidMojoMediaClient() {}
 
 // MojoMediaClient overrides.
 
 scoped_ptr<AudioDecoder> AndroidMojoMediaClient::CreateAudioDecoder(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
   return make_scoped_ptr(new MediaCodecAudioDecoder(task_runner));
 }
 
 scoped_ptr<CdmFactory> AndroidMojoMediaClient::CreateCdmFactory(
     mojo::shell::mojom::InterfaceProvider* interface_provider) {
   return make_scoped_ptr(new AndroidCdmFactory(
       base::Bind(&CreateProvisionFetcher, interface_provider)));
 }
 
 }  // namespace media