MD History: Refactored design for displaying history information

chrome/browser/resources/md_history/history_card.js

-// 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.
-
-Polymer({
-  is: 'history-card',
-
-  properties: {
-    // The date of these history items.
-    historyDate: {
-      type: String,
-      value: ''
-    },
-
-    // The list of history results that were accessed for a particular day in
-    // reverse chronological order.
-    historyItems: {
-      type: Array,
-      value: function() { return []; }
-    }
-  },
-
-  /**
-   * Check whether the time difference between the given historyItem and the
-   * next one is large enough for a spacer to be required.
-   * @param {number} index The index number of the first item being compared.
-   * @param {number} itemsLength The number of items on the card. Used to force
-   * needsTimeGap_ to run for every item if an item is deleted from the card.
-   * @return {boolean} Whether or not time gap separator is required.
-   * @private
-   */
-  needsTimeGap_: function(index, itemsLength) {
-    var items = this.historyItems;
-    return index + 1 < items.length &&
-        items[index].time - items[index + 1].time > BROWSING_GAP_TIME;
-  }
-});