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

chromeos/audio/cras_audio_handler.h

Index: chromeos/audio/cras_audio_handler.h
diff --git a/chromeos/audio/cras_audio_handler.h b/chromeos/audio/cras_audio_handler.h
index 9f6520e5f42133ec40d0a3e102532d8fa3d78d2a..83aeaff0745ffe6be44d3c421b54e680eb2e6a7c 100644
--- a/chromeos/audio/cras_audio_handler.h
+++ b/chromeos/audio/cras_audio_handler.h
@@ -184,6 +184,13 @@ class CHROMEOS_EXPORT CrasAudioHandler : public CrasAudioClient::Observer,
   // Removes all active audio nodes, including the primary active ones.
   virtual void RemoveAllActiveNodes();
 
+  // Swaps the left and right channel of 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.
+  // If the feature is not supported on the primary active output node, nothing
+  // happens.
+  virtual void SwapLeftRight(bool swap);
+
   // Enables error logging.
   virtual void LogErrors();