Initial implementation of stashed message ports, blink side

Source/modules/serviceworkers/StashedPortCollection.idl

Index: Source/modules/serviceworkers/StashedPortCollection.idl
diff --git a/Source/modules/serviceworkers/StashedPortCollection.idl b/Source/modules/serviceworkers/StashedPortCollection.idl
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+// 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://github.com/mkruisselbrink/navigator-connect/blob/gh-pages/docs/api-idea.md#persisted-messageports
+// TODO(mek): Link to actual spec when this is added there.
+[
+    Exposed=ServiceWorker,
+    RuntimeEnabled=NavigatorConnect,
+    TypeChecking=Interface,
+] interface StashedPortCollection : EventTarget {
+    [CallWith=ScriptState] StashedMessagePort add(USVString name, MessagePort port);
+    // Promise<sequence<StashedMessagePort>> match(UVString name);
+    attribute EventHandler onmessage;
+};