Flip the left/right speaker when the device is in yoga mode.

ash/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_SYSTEM_AUDIO_TRAY_AUDIO_DELEGATE_H_
 #define ASH_SYSTEM_AUDIO_TRAY_AUDIO_DELEGATE_H_
 
 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 icon to use for the active output device.
   virtual int GetActiveOutputDeviceIconId() = 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 audio channel mode.
+  virtual void SetAudioChannelMode(AudioChannelMode mode) = 0;
 };
 
 }  // namespace system
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_AUDIO_TRAY_AUDIO_DELEGATE_H_