chromeos: Combine TrayAudio and TrayAudioChromeOs classes

ash/common/system/audio/tray_audio_delegate.h

-// Copyright 2014 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 ASH_COMMON_SYSTEM_AUDIO_TRAY_AUDIO_DELEGATE_H_
-#define ASH_COMMON_SYSTEM_AUDIO_TRAY_AUDIO_DELEGATE_H_
-
-namespace gfx {
-struct VectorIcon;
-}
-
-namespace ash {
-namespace system {
-
-class ASH_EXPORT TrayAudioDelegate {
- public:
-  enum { kNoAudioDeviceIcon = -1 };
-  enum AudioChannelMode {
-    NORMAL,
-    LEFT_RIGHT_SWAPPED,
-  };
-
-  virtual ~TrayAudioDelegate() {}
-
-  // Sets the volume level of the output device to the minimum level which is
-  // deemed to be audible.
-  virtual void AdjustOutputVolumeToAudibleLevel() = 0;
-
-  // Gets the default level in the range 0%-100% at which the output device
-  // should be muted.
-  virtual int GetOutputDefaultVolumeMuteLevel() = 0;
-
-  // Gets the non-MD icon to use for the active output device.
-  // TODO(mohsen): Remove this once material design is enabled by default. See
-  // https://crbug.com/614453.
-  virtual int GetActiveOutputDeviceIconId() = 0;
-
-  // Gets the MD icon to use for the active output device.
-  virtual const gfx::VectorIcon& GetActiveOutputDeviceVectorIcon() = 0;
-
-  // Returns the volume level of the output device in the range 0%-100%.
-  virtual int GetOutputVolumeLevel() = 0;
-
-  // Returns true if the device has alternative inputs or outputs.
-  virtual bool HasAlternativeSources() = 0;
-
-  // Returns whether the output volume is muted.
-  virtual bool IsOutputAudioMuted() = 0;
-
-  // Sets the mute state of the output device.
-  virtual void SetOutputAudioIsMuted(bool is_muted) = 0;
-
-  // Sets the volume level of the output device in the range 0%-100%
-  virtual void SetOutputVolumeLevel(int level) = 0;
-
-  // Sets the internal speaker's channel mode.
-  virtual void SetInternalSpeakerChannelMode(AudioChannelMode mode) = 0;
-
-  // If necessary, sets the starting point for re-discovering the active HDMI
-  // output device caused by device entering/exiting docking mode, HDMI display
-  // changing resolution, or chromeos device suspend/resume. If
-  // |force_rediscovering| is true, it will force to set the starting point for
-  // re-discovering the active HDMI output device again if it has been in the
-  // middle of rediscovering the HDMI active output device.
-  virtual void SetActiveHDMIOutoutRediscoveringIfNecessary(
-      bool force_rediscovering) = 0;
-};
-
-}  // namespace system
-}  // namespace ash
-
-#endif  // ASH_COMMON_SYSTEM_AUDIO_TRAY_AUDIO_DELEGATE_H_