Start implementing new navigator.connect API

Source/modules/navigatorconnect/WorkerNavigatorServices.idl

-// Copyright 2014 The Chromium Authors. All rights reserved.
+// 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://mkruisselbrink.github.io/navigator-connect/#idl-def-NavigatorConnect
+// https://mkruisselbrink.github.io/navigator-connect/#idl-def-NavigatorServices
 [
     RuntimeEnabled=NavigatorConnect,
-] partial interface Navigator {
-    [CallWith=ScriptState] Promise connect(USVString url);
+]  partial interface WorkerNavigator {
+    [CallWith=ExecutionContext] readonly attribute ServicePortCollection services;
 };