bluetooth: Implement simulatePreconnectedPeripheral.

device/bluetooth/public/interfaces/test/fake_bluetooth.mojom

 // Copyright 2017 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;
 
 // FakeBluetooth and its related interfaces allow clients to control the global
 // Bluetooth State as well as simulate Bluetooth events including finding new
 // devices, simulating GATT attributes and its descendants, and simulating
 // success and error responses.
@@ skipping 19 matching lines @@
 
 // FakeCentral allows clients to simulate events that a device in the
 // Central/Observer role would receive as well as monitor the operations
 // performed by the device in the Central/Observer role.
 //
 // A Central interface would allow its clients to perform the operations and
 // receive events for two roles defined by the Bluetooth Spec: Observer and
 // Central. See Bluetooth 4.2 Vol 3 Part C 2.2.2 "Roles when Operation over an
 // LE Physical Transport".
 interface FakeCentral {
+  // Simulates a peripheral with |address| and |name| that has already
+  // been connected to the system.
+  //
+  // Platforms offer methods to retrieve devices that have already been
+  // connected to the system or weren't connected through the UA e.g. a user
+  // connected a peripheral through the system's settings. This method is
+  // intended to simulate peripherals that those methods would return.
+  SimulatePreconnectedPeripheral(string address, string name)
+      => (string peripheral_id);
 };