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

chromeos/audio/cras_audio_handler.cc

Index: chromeos/audio/cras_audio_handler.cc
diff --git a/chromeos/audio/cras_audio_handler.cc b/chromeos/audio/cras_audio_handler.cc
index c6453118b4c393381d38ddf2489b37e0845530f4..c036d4af63abf38c3f84897abfc59a53a60f941a 100644
--- a/chromeos/audio/cras_audio_handler.cc
+++ b/chromeos/audio/cras_audio_handler.cc
@@ -253,6 +253,16 @@ void CrasAudioHandler::RemoveAllActiveNodes() {
   }
 }
 
+void CrasAudioHandler::SwapLeftRight(bool swap) {
+  if (!active_output_node_id_) {
+    VLOG(1) << "SwapLeftRight: Cannot find primary active output node";
+    return;
+  }
+
+  chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->SwapLeftRight(
+      active_output_node_id_, swap);

[flackr, 2014/10/01 20:32:33]

We shouldn't swap the channels on any device except for the internal speakers:
https://code.google.com/p/chromium/codesearch#chromium/src/chromeos/audio/aud...

[jennyz, 2014/10/01 20:41:19]

Cras decides if the channel swapping is supported, for the current code, as I
can see, only the internal speaker supports this feature. cychiang@, please
correct me if I am wrong.

[jennyz, 2014/10/01 20:52:11]

Think again, you are right, we'd only guard to make this only applies to
internal speaker, will upload another patch soon, Thank!

[jennyz, 2014/10/01 21:30:33]

Done.

+}
+
 bool CrasAudioHandler::has_alternative_input() const {
   return has_alternative_input_;
 }