Switching WebRTC browser test from AudioManager::HasAudioOutputDevices() to AudioSystem interface.

media/audio/audio_system_impl.cc

 // Copyright 2017 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/audio_system_impl.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/task_runner_util.h"
 #include "media/audio/audio_device_description.h"
@@ skipping 103 matching lines @@
         base::Bind(on_has_devices_cb, audio_manager_->HasAudioInputDevices()));
     return;
   }
   base::PostTaskAndReplyWithResult(
       GetTaskRunner(), FROM_HERE,
       base::Bind(&AudioManager::HasAudioInputDevices,
                  base::Unretained(audio_manager_)),
       std::move(on_has_devices_cb));
 }
 
+void AudioSystemImpl::HasOutputDevices(OnBoolCallback on_has_devices_cb) const {
+  if (GetTaskRunner()->BelongsToCurrentThread()) {
+    GetTaskRunner()->PostTask(
+        FROM_HERE,
+        base::Bind(on_has_devices_cb, audio_manager_->HasAudioOutputDevices()));
+    return;
+  }
+  base::PostTaskAndReplyWithResult(
+      GetTaskRunner(), FROM_HERE,
+      base::Bind(&AudioManager::HasAudioOutputDevices,
+                 base::Unretained(audio_manager_)),
+      std::move(on_has_devices_cb));
+}
+
 void AudioSystemImpl::GetDeviceDescriptions(
     OnDeviceDescriptionsCallback on_descriptions_cp,
     bool for_input) {
   if (GetTaskRunner()->BelongsToCurrentThread()) {
     GetTaskRunner()->PostTask(
         FROM_HERE, base::Bind(on_descriptions_cp,
                               base::Passed(GetDeviceDescriptionsOnDeviceThread(
                                   audio_manager_, for_input))));
     return;
   }
 
   base::PostTaskAndReplyWithResult(
       GetTaskRunner(), FROM_HERE,
       base::Bind(&GetDeviceDescriptionsOnDeviceThread,
                  base::Unretained(audio_manager_), for_input),
       std::move(on_descriptions_cp));
 }
 
 AudioManager* AudioSystemImpl::GetAudioManager() const {
   return audio_manager_;
 }
 
 base::SingleThreadTaskRunner* AudioSystemImpl::GetTaskRunner() const {
   return audio_manager_->GetTaskRunner();
 }
 
 }  // namespace media