MD History: Trim long item titles to reduce effect on performance

chrome/browser/resources/md_history/history_item.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-checkbox/paper-checkbox.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="chrome://resources/html/icon.html">
 <link rel="import" href="chrome://resources/html/util.html">
 <link rel="import" href="chrome://history/constants.html">
@@ skipping 120 matching lines @@
         [[cardTitle_(numberOfItems, item.dateRelativeDay, searchTerm)]]
       </div>
       <div id="item-container">
         <paper-checkbox id="checkbox" on-tap="onCheckboxSelected_"
             checked="{{selected}}" disabled="[[selectionNotAllowed_()]]">
         </paper-checkbox>
         <span id="time-accessed">[[item.readableTimestamp]]</span>
         <div class="website-icon" id="icon"></div>
         <div id="title-and-domain">
           <a href="[[item.url]]" id="title" class="website-title">
-            <history-searched-label title="[[item.title]]"
+            <history-searched-label title="[[cropItemTitle_(item.title)]]"
                 search-term="[[searchTerm]]"></history-searched-label>
           </a>
           <span id="domain">[[item.domain]]</span>
         </div>
         <iron-icon icon="cr:star" id="bookmark-star"></iron-icon>
         <button is="paper-icon-button-light" id="menu-button"
             on-tap="onMenuButtonTap_">
           <iron-icon icon="cr:more-vert"></iron-icon>
         </button>
       </div>
       <template is="dom-if" if="[[hasTimeGap]]">
         <div id="time-gap-separator"></div>
       </template>
     </div>
   </template>
   <script src="chrome://history/history_item.js"></script>
 </dom-module>