MD History: Implement search functionality.

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 []; }
+    },
+
+    searchTerm: {
+      type: String,
+      value: ''
     }
   },
 
   /**
    * 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 {!HistoryEntry} historyItem The first item being compared.
+   * @param {string} search The search term associated with this item.
    * @return {boolean} Whether or not time gap separator is required.
    * @private
    */
-  needsTimeGap_: function(index) {
+  needsTimeGap_: function(index, historyItem, search) {
     var items = this.historyItems;
-    return index + 1 < items.length &&
+
+    if ((search == '') || (search == undefined)) {

[calamity, 2016/02/05 02:30:10]

(((Too) (many) parens))!

[hsampson, 2016/02/08 04:40:23]

Done.

+      return index + 1 < items.length &&
         items[index].time - items[index + 1].time > BROWSING_GAP_TIME;
+    } else {
+      return index + 1 < items.length &&
+          items[index].dateTimeOfDay != items[index + 1].dateTimeOfDay;
+    }
+  },
+
+  /**
+   * Create the title for the history-card holding all the results.
+   * @param {number} numberOfItems The number of items in the card.
+   * @param {string} search The search term associated with these results.
+   * @param {string} historyDate The day this card corresponds to if these
+   * results are part of a normal history search.
+   * @private
+   */
+  searchResultTitle_: function(numberOfItems, search, historyDate) {

[calamity, 2016/02/05 02:30:10]

This should be called something like 'cardTitle_' since it is used for both
search results _and_ normal cards.

The comment should be updated to reflect what the function does.

e.g

// Generates the title for this history card.

[hsampson, 2016/02/08 04:40:23]

Done.

+    var resultId = numberOfItems == 1 ? 'searchResult' : 'searchResults';
+
+    if (search == '') {

[tsergeant, 2016/02/04 02:28:49]

Nit: Remove {}

Also use a ternary expression if you want, but it would be pretty long, so I'll
leave it up to you.

[hsampson, 2016/02/08 04:40:23]

Done.

+      return historyDate;
+    } else {
+      return loadTimeData.getStringF('foundSearchResults', numberOfItems,
+                                     loadTimeData.getString(resultId), search);
+    }
   }
 });