Reland: Pass task runners to AudioManager constructor.

chromecast/media/audio/cast_audio_manager.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 "chromecast/media/audio/cast_audio_manager.h"
 
 #include <algorithm>
 #include <string>
 
 #include "chromecast/media/audio/cast_audio_output_stream.h"
 #include "chromecast/media/cma/backend/media_pipeline_backend_manager.h"
 
 namespace {
 // TODO(alokp): Query the preferred value from media backend.
 const int kDefaultSampleRate = 48000;
 
 // Define bounds for the output buffer size (in frames).
 // Note: These values are copied from AudioManagerPulse implementation.
 // TODO(alokp): Query the preferred value from media backend.
 static const int kMinimumOutputBufferSize = 512;
 static const int kMaximumOutputBufferSize = 8192;
 static const int kDefaultOutputBufferSize = 2048;
 }  // namespace
 
 namespace chromecast {
 namespace media {
 
-CastAudioManager::CastAudioManager(::media::AudioLogFactory* audio_log_factory,
-                                   MediaPipelineBackendManager* backend_manager)
-    : AudioManagerBase(audio_log_factory), backend_manager_(backend_manager) {
-}
+CastAudioManager::CastAudioManager(
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
+    ::media::AudioLogFactory* audio_log_factory,
+    MediaPipelineBackendManager* backend_manager)
+    : AudioManagerBase(std::move(task_runner),
+                       std::move(worker_task_runner),
+                       audio_log_factory),
+      backend_manager_(backend_manager) {}
 
 CastAudioManager::~CastAudioManager() {
   Shutdown();
 }
 
 bool CastAudioManager::HasAudioOutputDevices() {
   return true;
 }
 
 bool CastAudioManager::HasAudioInputDevices() {
@@ skipping 71 matching lines @@
   }
 
   ::media::AudioParameters output_params(
       ::media::AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
       sample_rate, bits_per_sample, buffer_size);
   return output_params;
 }
 
 }  // namespace media
 }  // namespace chromecast