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 AdapterInfo {
+  string address;
+  string name;
+  bool initialized;
+  bool present;
+  bool powered;
+  bool discoverable;
+  bool discovering;
+};
+
 struct DeviceInfo {
   string? name;
   string name_for_display;
   string id;
   string address;
 };
 
 interface Adapter {
+  // Gets basic information about the adapter.
+  GetInfo() => (AdapterInfo info);
+
   // 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);
 };
 
 interface AdapterFactory {
   // Gets an Adapter interface. Returns null if Bluetooth is not supported.
   GetAdapter() => (Adapter? adapter);
 };