[MD History] Add routing to the synced devices page.

chrome/test/data/webui/md_history/history_routing_test.js

+// Copyright 2016 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.
+
+cr.define('md_history.history_routing_test', function() {
+  function registerTests() {
+    suite('synced-tabs', function() {
+      var app;
+      var list;
+
+      suiteSetup(function() {
+        app = $('history-app');
+        sidebar = app.$['side-bar']
+      });
+
+      test('changing route changes active view', function() {
+        assertEquals('history', app.$.content.selected);
+        app.set('routeData_.page', 'syncedTabs');
+        return flush().then(function() {
+          assertEquals('syncedTabs', app.$.content.selected);
+        });
+      });
+
+      test('route updates from sidebar', function() {
+        var menu = sidebar.$.menu;
+        assertEquals('', app.routeData_.page);
+
+        MockInteractions.tap(menu.children[1]);
+        assertEquals('syncedTabs', app.routeData_.page);
+
+        MockInteractions.tap(menu.children[0]);
+        assertEquals('', app.routeData_.page);
+      });
+
+      teardown(function() {
+        app.set('routeData_.page', '');
+      });
+    });
+  }
+  return {
+    registerTests: registerTests
+  };
+});