Fix the bluetooth audio device id changing on the fly issue and the active device inconsistent issu…

chromeos/audio/cras_audio_handler.h

Index: chromeos/audio/cras_audio_handler.h
diff --git a/chromeos/audio/cras_audio_handler.h b/chromeos/audio/cras_audio_handler.h
index a3e706af52f1903562a898edf29c34252ed17f4b..6777ced362590dc9cdcd64a7afa853efbef20df0 100644
--- a/chromeos/audio/cras_audio_handler.h
+++ b/chromeos/audio/cras_audio_handler.h
@@ -238,6 +238,9 @@ class CHROMEOS_EXPORT CrasAudioHandler : public CrasAudioClient::Observer,
   void HandleGetNodesError(const std::string& error_name,
                            const std::string& error_msg);
 
+  // Returns true if |device| is not found in audio_devices_.
+  bool FoundNewDevice(const AudioDevice& device);
+
   scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler_;
   base::WeakPtrFactory<CrasAudioHandler> weak_ptr_factory_;
   ObserverList<AudioObserver> observers_;