fallback to null sink in WebAudioSourceProvider::Initialize() + UMA stats for device status

media/audio/null_audio_sink.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 "media/audio/null_audio_sink.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "media/audio/fake_audio_worker.h"
@@ skipping 58 matching lines @@
   fake_worker_->Stop();
   playing_ = false;
 }
 
 bool NullAudioSink::SetVolume(double volume) {
   // Audio is always muted.
   return volume == 0.0;
 }
 
 OutputDeviceInfo NullAudioSink::GetOutputDeviceInfo() {
-  return OutputDeviceInfo();
+  return OutputDeviceInfo(OUTPUT_DEVICE_STATUS_OK);
 }
 
 bool NullAudioSink::CurrentThreadIsRenderingThread() {
   return task_runner_->BelongsToCurrentThread();
 }
 
 void NullAudioSink::SwitchOutputDevice(const std::string& device_id,
                                        const url::Origin& security_origin,
                                        const OutputDeviceStatusCB& callback) {
   callback.Run(OUTPUT_DEVICE_STATUS_ERROR_INTERNAL);
@@ skipping 13 matching lines @@
 void NullAudioSink::StartAudioHashForTesting() {
   DCHECK(!initialized_);
   audio_hash_.reset(new AudioHash());
 }
 
 std::string NullAudioSink::GetAudioHashForTesting() {
   return audio_hash_ ? audio_hash_->ToString() : std::string();
 }
 
 }  // namespace media