MD History: Implement search functionality.

chrome/browser/resources/md_history/history_card.html

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/shadow.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout.html">
 <link rel="import" href="chrome://history/history_item.html">
 
 <dom-module id="history-card">
   <template>
     <style>
       :host {
         @apply(--layout-center);
         @apply(--layout-vertical);
         padding: 0 24px 20px 24px;
       }
 
+      :host([hidden]) {

[tsergeant, 2016/02/02 02:57:36]

Is this needed? I can't see you setting hidden anywhere.

[hsampson, 2016/02/03 02:37:58]

Yes this is needed so that the iron-list can hide cards it has rendered but
doesn't need, otherwise you end up with results from the previous display at the
bottom of your search results.

+        display: none !important;
+      }
+
       #main-container {
         @apply(--shadow-elevation-2dp);
         background: #fff;
         border-radius: 2px;
         max-width: 960px;
         width: 100%;
       }
 
       #time-gap-separator {
         -webkit-border-start: 1px solid #888;
@@ skipping 13 matching lines @@
         font-weight: 500;
         height: 48px;
       }
 
       #history-item-list {
         padding: 8px 0;
       }
     </style>
 
     <div id="main-container">
-      <div id="date-accessed">[[historyDate]]</div>
+      <template is="dom-if" if="{{!isNotSearchResult_(searchTerm)}}">

[tsergeant, 2016/02/02 02:57:36]

Can you get rid of the dom-ifs by having a single computed function which
depends on searchTerm, historyItems.length and historyDate? The if would be
internal to that function.

[hsampson, 2016/02/03 02:37:58]

Done.

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

Yay!

+        <div id="date-accessed">
+          {{searchResultTitle_(historyItems.length,searchTerm)}}

[tsergeant, 2016/02/02 02:57:36]

Nit: space after comma

[hsampson, 2016/02/03 02:37:58]

Done.

+        </div>
+      </template>
+      <template is="dom-if" if="{{isNotSearchResult_(searchTerm)}}">
+        <div id="date-accessed">[[historyDate]]</div>
+      </template>
       <div id="history-item-list">
         <template is="dom-repeat" items="{{historyItems}}"
             as="historyItem">
           <history-item time-accessed="{{historyItem.dateTimeOfDay}}"
               website-title="{{historyItem.title}}"
               website-domain="{{historyItem.domain}}"
               website-url="{{historyItem.url}}"
               starred="{{historyItem.starred}}"
               selected="{{historyItem.selected}}"
-              timestamp="{{historyItem.time}}">
+              timestamp="{{historyItem.time}}"
+              search-term="[[searchTerm]]">
           </history-item>
           <template is="dom-if" if="{{needsTimeGap_(index, historyItem)}}">
             <div id="time-gap-separator"></div>
           </template>
         </template>
       </div>
     </div>
   </template>
   <script src="chrome://history/history_card.js"></script>
 </dom-module>