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

chromeos/dbus/cras_audio_client.h

Index: chromeos/dbus/cras_audio_client.h
diff --git a/chromeos/dbus/cras_audio_client.h b/chromeos/dbus/cras_audio_client.h
index 84ff7c8bc7750fb3dca6c69e2652011f2e84ccf7..560042ce7d41b435523725cb7f0b7f508ea31f1c 100644
--- a/chromeos/dbus/cras_audio_client.h
+++ b/chromeos/dbus/cras_audio_client.h
@@ -115,6 +115,11 @@ class CHROMEOS_EXPORT CrasAudioClient : public DBusClient {
   // removing an active output node added by AddActiveOutputNode.
   virtual void RemoveActiveOutputNode(uint64 node_id) = 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(uint64 node_id, bool swap) = 0;
+
   // Creates the instance.
   static CrasAudioClient* Create();