Restore extension tab after reload

Work-around for https://crbug.com/511670

extensions/chromium/restoretab.js

@@ -0,0 +1,33 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+/*
+Copyright 2015 Mozilla Foundation
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/**
+ * This is part of the work-around for crbug.com/511670.
+ * - chromecom.js sets the URL and history state upon unload.
+ * - extension-router.js retrieves the saved state and opens restoretab.html
+ * - restoretab.html (this script) restores the URL and history state.
+ */
+'use strict';
+
+var url = decodeURIComponent(location.search.slice(1));
+var historyState = decodeURIComponent(location.hash.slice(1));
+
+historyState = historyState === 'undefined' ? null : JSON.parse(historyState);
+
+history.replaceState(historyState, null, url);
+location.reload();