bluetooth: Add AdapterInfo in Bluetooth adapter service.

device/bluetooth/public/interfaces/adapter.mojom

 // Copyright 2016 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.
 
 module bluetooth.mojom;
 
 struct DeviceInfo {
   string? name;
   string name_for_display;
   string id;
   string address;
 };
 
 interface Adapter {
+  // Gets the address of the adapter.
+  // Returns empty string if address cannot be retrieved.
+  GetAddress() => (string address);
+
+  // Gets the name of the adapter.
+  // Returns empty string if name cannot be retrieved.
+  GetName() => (string name);
+
+  // Returns true if adapter is powered.
+  IsPowered() => (bool powered);
+
+  // Returns true if adapter is present.
+  IsPresent() => (bool present);
+
   // Retrieves the list of the devices known by the adapter including Connected
   // Devices, GATT Connected Devices, Paired Devices and Devices discovered
   // during a classic or low-energy scan.
   GetDevices() => (array<DeviceInfo> devices);
 
   // Sets the client that listens for the adapter's events.
   SetClient(AdapterClient client);
 };
 
 interface AdapterClient {
   // Called the first time a device is discovered.
   DeviceAdded(DeviceInfo device);
 
   // Called after the device hasn't been seen for 3 minutes.
   DeviceRemoved(DeviceInfo device);
 };