Fix the wrong output device switching caused by an input device being plugged in.

chromeos/audio/cras_audio_handler.h

 // Copyright (c) 2013 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.
 
 #ifndef CHROMEOS_AUDIO_CRAS_AUDIO_HANDLER_H_
 #define CHROMEOS_AUDIO_CRAS_AUDIO_HANDLER_H_
 
 #include <queue>
 
 #include "base/basictypes.h"
@@ skipping 212 matching lines @@
   // |new_active_device|.
   bool ChangeActiveDevice(const AudioDevice& new_active_device,
                           uint64* current_active_node_id);
 
   // Returns true if the audio nodes change is caused by some non-active
   // audio nodes unplugged.
   bool NonActiveDeviceUnplugged(size_t old_devices_size,
                                 size_t new_device_size,
                                 uint64 current_active_node);
 
+  // Returns true if there is any device change for for input or output,
+  // specified by |is_input|.
+  bool HasDeviceChange(const AudioNodeList& new_nodes, bool is_input);
+
   // Handles dbus callback for GetNodes.
   void HandleGetNodes(const chromeos::AudioNodeList& node_list, bool success);
 
   scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler_;
   base::WeakPtrFactory<CrasAudioHandler> weak_ptr_factory_;
   ObserverList<AudioObserver> observers_;
 
   // Audio data and state.
   AudioDeviceMap audio_devices_;
 
@@ skipping 11 matching lines @@
 
   bool output_mute_locked_;
   bool input_mute_locked_;
 
   DISALLOW_COPY_AND_ASSIGN(CrasAudioHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_AUDIO_CRAS_AUDIO_HANDLER_H_