bluetooth: Add Device service for chrome://bluetooth-internals.

device/bluetooth/public/interfaces/device.mojom

Index: device/bluetooth/public/interfaces/device.mojom
diff --git a/device/bluetooth/public/interfaces/device.mojom b/device/bluetooth/public/interfaces/device.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..b629bab1703d8441c10271394e9345ce2845b566
--- /dev/null
+++ b/device/bluetooth/public/interfaces/device.mojom
@@ -0,0 +1,17 @@
+// 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 address;
+};
+
+interface Device {
+  // Gets basic information about the device. Returns null, if no device is
+  // available.
+  GetInfo() => (DeviceInfo? info);
+};