device/bluetooth:Implement Register() for BluetoothAudioSinkChromeOS.

device/bluetooth/bluetooth_audio_sink_chromeos.h

Index: device/bluetooth/bluetooth_audio_sink_chromeos.h
diff --git a/device/bluetooth/bluetooth_audio_sink_chromeos.h b/device/bluetooth/bluetooth_audio_sink_chromeos.h
index 3f9f839ddaebea0fd2e287be735849aa6ef202f1..9e83ea30556d5ac4b5616c451ffb22b0173882be 100644
--- a/device/bluetooth/bluetooth_audio_sink_chromeos.h
+++ b/device/bluetooth/bluetooth_audio_sink_chromeos.h
@@ -24,6 +24,8 @@
 
 namespace chromeos {
 
+class BluetoothAdapterChromeOS;

[armansito, 2015/01/27 04:38:06]

I don't see you dealing with BluetoothAdapterChromeOS pointers in this header.
Why is this forward declaration necessary?

[Miao, 2015/01/28 02:05:02]

Removed.

+
 class DEVICE_BLUETOOTH_EXPORT BluetoothAudioSinkChromeOS
     : public device::BluetoothAudioSink,
       public device::BluetoothAdapter::Observer,
@@ -88,6 +90,14 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAudioSinkChromeOS
   // updated.
   void VolumeChanged(uint16_t volume);
 
+  // Called when the registration of Media Endpoint Done.

[armansito, 2015/01/27 04:38:06]

s/Done/has succeeded/

[Miao, 2015/01/28 02:05:01]

Done.

+  void OnRegisterSucceeded(const base::Closure& callback);
+
+  // Called when the registration of Media Endpoint failed.
+  void OnRegisterFailed(const BluetoothAudioSink::ErrorCallback& error_back,
+                        const std::string& error_name,
+                        const std::string& error_message);
+
   // Reads from the file descriptor acquired via Media Transport object and
   // notify |observer_| while the audio data is available.
   void ReadFromFD();