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

ash/system/audio/tray_audio.cc

Index: ash/system/audio/tray_audio.cc
diff --git a/ash/system/audio/tray_audio.cc b/ash/system/audio/tray_audio.cc
index a3b32ca96a822b0a1d33de7e9fb6b443055391d9..dca4b1d023ebac98fbe0fe807e34b2c505d484e0 100644
--- a/ash/system/audio/tray_audio.cc
+++ b/ash/system/audio/tray_audio.cc
@@ -7,6 +7,7 @@
 #include <cmath>
 
 #include "ash/ash_constants.h"
+#include "ash/display/display_manager.h"
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/shell.h"
 #include "ash/system/audio/tray_audio_delegate.h"
@@ -26,6 +27,7 @@
 #include "third_party/skia/include/core/SkRect.h"
 #include "third_party/skia/include/effects/SkGradientShader.h"
 #include "ui/gfx/canvas.h"
+#include "ui/gfx/display.h"
 #include "ui/gfx/font_list.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_skia_operations.h"
@@ -127,6 +129,12 @@ void TrayAudio::OnAudioNodesChanged() {
 
 void TrayAudio::OnActiveOutputNodeChanged() {
   Update();
+  // Swap left/right channel if it is in Yoga mode.
+  const DisplayInfo& display_info =
+      Shell::GetInstance()->display_manager()->GetDisplayInfo(
+          gfx::Display::InternalDisplayId());
+  audio_delegate_->SwapLeftRight(display_info.rotation() ==
+                                 gfx::Display::ROTATE_180);
 }
 
 void TrayAudio::OnActiveInputNodeChanged() {