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

ash/system/audio/tray_audio_delegate.h

Index: ash/system/audio/tray_audio_delegate.h
diff --git a/ash/system/audio/tray_audio_delegate.h b/ash/system/audio/tray_audio_delegate.h
index 8a6260f702b9f1773225af870bd545a0cae47eac..41aa7902a5814e05bcb9544b5aa33281b22edab4 100644
--- a/ash/system/audio/tray_audio_delegate.h
+++ b/ash/system/audio/tray_audio_delegate.h
@@ -40,6 +40,11 @@ class ASH_EXPORT TrayAudioDelegate {
 
   // Sets the volume level of the output device in the range 0%-100%
   virtual void SetOutputVolumeLevel(int level) = 0;
+
+  // Swaps the left and right channel of the the primary active output device.
+  // Swap the left and right channel if |swap| is true; otherwise, swap the left
+  // and right channel back to the normal mode.
+  virtual void SwapLeftRight(bool swap) = 0;

[oshima, 2014/09/30 22:29:53]

It'd be better to have something like: (assuming this is how it works)

enum AudioChannelMode {  // Or SwapMode, LeftRightMode?
  NORMAL,
  LEFT_RIGHT_SWAPPED,
}

SetAutioChannelMode(AudioChannelMode);

[jennyz, 2014/10/01 00:22:59]

Done.

 };
 
 }  // namespace system