Fix speaker flipping issue when the device rotates.

ash/common/system/chromeos/audio/tray_audio_chromeos.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/system/chromeos/audio/tray_audio_chromeos.h"
 
 #include "ash/common/system/audio/volume_view.h"
 #include "ash/common/system/chromeos/audio/audio_detailed_view.h"
 #include "ash/common/system/chromeos/audio/tray_audio_delegate_chromeos.h"
 #include "ash/common/wm_shell.h"
@@ skipping 60 matching lines @@
   TrayAudio::OnDisplayRemoved(old_display);
 
   // This event will be triggered when the lid of the device is closed to enter
   // the docked mode, we should always start or re-start HDMI re-discovering
   // grace period right after this event.
   audio_delegate_->SetActiveHDMIOutoutRediscoveringIfNecessary(true);
 }
 
 void TrayAudioChromeOs::OnDisplayMetricsChanged(const display::Display& display,
                                                 uint32_t changed_metrics) {
+  TrayAudio::OnDisplayMetricsChanged(display, changed_metrics);
+
   // The event could be triggered multiple times during the HDMI display
   // transition, we don't need to restart HDMI re-discovering grace period
   // it is already started earlier.
   audio_delegate_->SetActiveHDMIOutoutRediscoveringIfNecessary(false);
 }
 
 void TrayAudioChromeOs::SuspendDone(const base::TimeDelta& sleep_duration) {
   // This event is triggered when the device resumes after earlier suspension,
   // we should always start or re-start HDMI re-discovering
   // grace period right after this event.
   audio_delegate_->SetActiveHDMIOutoutRediscoveringIfNecessary(true);
 }
 
 }  // namespace ash