bluetooth: Add FakeBluetooth interface

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

Index: device/bluetooth/public/interfaces/test/fake_bluetooth.mojom
diff --git a/device/bluetooth/public/interfaces/test/fake_bluetooth.mojom b/device/bluetooth/public/interfaces/test/fake_bluetooth.mojom
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index 0000000000000000000000000000000000000000..dc3802c9e68aa7ae25349d10d51c1e3aa5515f29
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+++ b/device/bluetooth/public/interfaces/test/fake_bluetooth.mojom
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+// 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.
+
+// FakeBluetooth allows clients to control the global Bluetooth state.
+interface FakeBluetooth {
+  // Set it to indicate whether a Bluetooth radio (capable of BLE) is available
+  // on the user's system. Not to be confused with Bluetooth support. For
+  // example, Windows 7 is a platform that doesn't support BLE so LE
+  // Availability would be irrelevant. Windows 10 on the other hand does support
+  // Low Energy so LE Availability depends on whether or not a Bluetooth Radio
+  // is present on the machine.
+  SetLEAvailability(bool available) => ();
+};