Start implementing new navigator.connect API

Source/modules/navigatorconnect/ServicePortCollection.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://mkruisselbrink.github.io/navigator-connect/#idl-def-ServicePortCollection
+[
+    Exposed=(Window,Worker),
+    RuntimeEnabled=NavigatorConnect,
+]  interface ServicePortCollection : EventTarget {
+    [CallWith=ScriptState] Promise<ServicePort> connect(DOMString url, optional ServicePortConnectOptions options);
+    [CallWith=ScriptState] Promise<ServicePort> match(ServicePortMatchOptions options);
+    [CallWith=ScriptState] Promise<sequence<ServicePort>> matchAll(optional ServicePortMatchOptions options);
+    // TODO(mek): The spec has [Exposed=ServiceWorker] for onconnect, this is not currently
+    // supported by blink bindings, so figure out if this is needed.
+    attribute EventHandler onconnect;
+    attribute EventHandler onmessage;
+    attribute EventHandler onclose;
+};