Switching AudioOutputAuthorizationHandler from using AudioManager interface to AudioSystem one.

media/audio/audio_system.h

 // 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.
 
 #ifndef MEDIA_AUDIO_AUDIO_SYSTEM_H_
 #define MEDIA_AUDIO_AUDIO_SYSTEM_H_
 
 #include "base/callback.h"
 #include "media/base/audio_parameters.h"
 #include "media/base/media_export.h"
@@ skipping 12 matching lines @@
 
   static AudioSystem* Get();
 
   virtual ~AudioSystem();
 
   // Callback will receive invalid parameters if the device is not found.
   virtual void GetInputStreamParameters(
       const std::string& device_id,
       OnAudioParamsCallback on_params_cb) const = 0;
 
+  // If media::AudioDeviceDescription::IsDefaultDevice(device_id) is true,
+  // callback will receive the parameters of the default output device.
+  // Callback will receive invalid parameters if the device (default or not) is

[o1ka, 2017/02/14 11:37:03]

guidou@:
AudioOutputAuthorizationHandler will fall back to UnavailableDeviceParameters in
TryToFixAudioParameters(), so the behavior is not changed for authorization.
Do we probably want to change it in the future to notify that the device is not
found? And when we can actually hit it? (Looks like it's if the device
disappeared after enumeration?)

+  // not found.
+  virtual void GetOutputStreamParameters(
+      const std::string& device_id,
+      OnAudioParamsCallback on_params_cb) const = 0;
+
   virtual void HasInputDevices(OnBoolCallback on_has_devices_cb) const = 0;
 
   // Must not be used for anything but stream creation.
   virtual AudioManager* GetAudioManager() const = 0;
 
  protected:
   // Sets the global AudioSystem pointer to the specified non-null value.
   static void SetInstance(AudioSystem* audio_system);
 
   // Sets the global AudioSystem pointer to null if it equals the specified one.
   static void ClearInstance(const AudioSystem* audio_system);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_SYSTEM_H_