MD History: Refactored design for displaying history information

chrome/browser/resources/md_history/history_item.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-item',
 
   properties: {
-    timeAccessed_: {
+    // The date of these history items.
+    historyDate: {
       type: String,
       value: ''
     },
 
-    websiteTitle_: {
+    timeAccessed: {
       type: String,
       value: ''
     },
+
+    websiteTitle: {
+      type: String,
+      value: ''
+    },
 
     // Domain is the website text shown on the history-item next to the title.
     // Gives the user some idea of which history items are different pages
     // belonging to the same site, and can be used to look for more items
     // from the same site.
-    websiteDomain_: {
+    websiteDomain: {
       type: String,
       value: ''
     },
 
     // The website url is used to define where the link should take you if
     // you click on the title, and also to define which icon the history-item
     // should display.
-    websiteUrl_: {
+    websiteUrl: {
       type: String,
       value: '',
       observer: 'showIcon_'
     },
 
     // If the website is a bookmarked page starred is true.
     starred: {
       type: Boolean,
       value: false,
       reflectToAttribute: true
     },
 
     // The time in seconds of when the website was accessed.
-    timestamp_: {
+    timestamp: {
       type: Number,
       value: 0
     },
 
     selected: {
       type: Boolean,
       value: false,
       notify: true
+    },
+
+    isCardStart: {
+      type: Boolean,
+      value: false,
+      reflectToAttribute: true
+    },
+
+    isCardEnd: {
+      type: Boolean,
+      value: false,
+      reflectToAttribute: true
+    },
+
+    hasTimeGap: {
+      type: Boolean,
+      value: false
     }
   },
 
   /**
    * When a history-item is selected the toolbar is notified and increases
    * or decreases its count of selected items accordingly.
    * @private
    */
   onCheckboxSelected_: function() {
     this.fire('history-checkbox-select', {
       countAddition: this.$.checkbox.checked ? 1 : -1
     });
   },
 
   /**
    * When the url for the history-item is set, the icon associated with this
    * website is also set.
    * @private
    */
   showIcon_: function() {
     this.$['website-icon'].style.backgroundImage =
-        getFaviconImageSet(this.websiteUrl_);
+        getFaviconImageSet(this.websiteUrl);
   },
 
   /**
    * Fires a custom event when the menu button is clicked. Sends the details of
    * the history item and where the menu should appear.
    */
   onMenuButtonTap_: function(e) {
     var position = this.$['menu-button'].getBoundingClientRect();
 
     this.fire('toggle-menu', {
       x: position.left,
       y: position.top,
-      accessTime: this.timestamp_
+      accessTime: this.timestamp
     });
 
     // Stops the 'tap' event from closing the menu when it opens.
     e.stopPropagation();
   },
 
   selectionNotAllowed_: function() {
+    // return false;

[tsergeant, 2016/02/11 02:43:02]

Remove this.

[yingran, 2016/02/12 02:03:05]

Done.

     return !loadTimeData.getBoolean('allowDeletingHistory');
   }
 });