MD History: Refactored design for displaying history information

chrome/test/data/webui/md_history/history_card_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_card_test', function() {
-  function registerTests() {
-    suite('history-card', function() {
-      test('basic separator insertion', function(done) {
-        var element = document.createElement('history-card');
-        element.historyItems = [
-          {"time": "1000000000"},
-          {"time": "10000000"},
-          {"time": "900000"}
-        ];
-        flush(function() {
-          // Check that the correct number of time gaps are inserted.
-          var spacers =
-              Polymer.dom(element.root).querySelectorAll('#time-gap-separator');
-          assertEquals(2, spacers.length);
-          done();
-        });
-      });
-    });
-  }
-  return {
-    registerTests: registerTests
-  };
-});