Implement the Blink side of RequestDeviceOptions.

Source/modules/bluetooth/RequestDeviceOptions.idl

Index: Source/modules/bluetooth/RequestDeviceOptions.idl
diff --git a/Source/modules/bluetooth/RequestDeviceOptions.idl b/Source/modules/bluetooth/RequestDeviceOptions.idl
new file mode 100644
index 0000000000000000000000000000000000000000..dc1bd30626f5e87850b2ebd99184419738e29b99
--- /dev/null
+++ b/Source/modules/bluetooth/RequestDeviceOptions.idl
@@ -0,0 +1,11 @@
+// Copyright 2015 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.
+
+// https://webbluetoothcg.github.io/web-bluetooth/#idl-def-requestdeviceoptions
+
+dictionary RequestDeviceOptions {
+    required sequence<BluetoothScanFilter>  filters;
+    sequence<BluetoothServiceUUID> optionalServices/* = []*/;
+    // TODO: Fix https://crbug.com/500638 and uncomment the default value above.
+};