bluetooth: Blink-side implementation of getCharacteristic.

Source/modules/bluetooth/BluetoothGATTService.idl

 // 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-bluetoothgattservice
 
 // Implement BluetoothGATTService interface: https://crbug.com/483342
 
+typedef DOMString BluetoothCharacteristicUUID;

[Jeffrey Yasskin, 2015/06/03 00:24:04]

Add the same TODO here as you have in GATTRemoteServer, I think.

[ortuno, 2015/06/03 21:57:04]

I have another patch where I implemented some of BluetoothUUID. It seems that we
can't share typedefs across idl files. So we have to define them in all IDL
files :(

[Jeffrey Yasskin, 2015/06/03 23:22:52]

Oh, fun.

 typedef DOMString UUID;
 
 [
     GarbageCollected,
     RuntimeEnabled=WebBluetooth,
 ] interface BluetoothGATTService { // : ServiceEventHandlers {
     readonly    attribute UUID            uuid;
     readonly    attribute boolean         isPrimary;
     // readonly    attribute BluetoothDevice device;
-    // Promise<BluetoothGATTCharacteristic>           getCharacteristic(BluetoothCharacteristicUUID characteristic);
+    [CallWith=ScriptState] Promise<BluetoothGATTCharacteristic>           getCharacteristic(BluetoothCharacteristicUUID characteristic);
     // Promise<sequence<BluetoothGATTCharacteristic>> getCharacteristics(optional BluetoothCharacteristicUUID characteristic);
     // Promise<BluetoothGATTService>                  getIncludedService(BluetoothServiceUUID service);
     // Promise<sequence<BluetoothGATTService>>        getIncludedServices(optional BluetoothServiceUUID service);
 };