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

device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java

Index: device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java
diff --git a/device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java b/device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java
index 9287f85865b8c6e16c2d07a4959a7a8fa2568cb1..96634b39ed023efa17c77ab4604405bd05621b7e 100644
--- a/device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java
+++ b/device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java
@@ -18,7 +18,10 @@ import android.bluetooth.le.ScanCallback;
 import android.bluetooth.le.ScanFilter;
 import android.bluetooth.le.ScanResult;
 import android.bluetooth.le.ScanSettings;
+import android.content.BroadcastReceiver;
 import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.pm.PackageManager;
 import android.os.Build;
 import android.os.ParcelUuid;
@@ -163,6 +166,14 @@ class Wrappers {
             return mContext.checkPermission(permission, Process.myPid(), Process.myUid())
                     == PackageManager.PERMISSION_GRANTED;
         }
+
+        public Intent registerReceiver(BroadcastReceiver receiver, IntentFilter filter) {
+            return mContext.registerReceiver(receiver, filter);
+        }
+
+        public void unregisterReceiver(BroadcastReceiver receiver) {
+            mContext.unregisterReceiver(receiver);
+        }
     }
 
     /**