bluetooth: android: register for adapter on/off events.

device/bluetooth/bluetooth_adapter_android.cc

Index: device/bluetooth/bluetooth_adapter_android.cc
diff --git a/device/bluetooth/bluetooth_adapter_android.cc b/device/bluetooth/bluetooth_adapter_android.cc
index 00cead7ddef0537243a8304a4a8114566633ad83..fc19a81237191c0f2fee63d5552140beeaa712b6 100644
--- a/device/bluetooth/bluetooth_adapter_android.cc
+++ b/device/bluetooth/bluetooth_adapter_android.cc
@@ -134,6 +134,13 @@ void BluetoothAdapterAndroid::RegisterAdvertisement(
   error_callback.Run(BluetoothAdvertisement::ERROR_UNSUPPORTED_PLATFORM);
 }
 
+void BluetoothAdapterAndroid::OnAdapterStateChanged(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& caller,
+    const bool powered) {
+  NotifyAdapterStateChanged(powered);
+}
+
 void BluetoothAdapterAndroid::OnScanFailed(
     JNIEnv* env,
     const JavaParamRef<jobject>& caller) {