MD History: Add tooltips for URLs on History page

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/browser_service.html">
@@ skipping 123 matching lines @@
         <div id="date-accessed" class="card-title">
           [[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">
+            <a href="[[item.url]]" id="title" class="website-title"
+                title="[[cropItemTitle_(item.title)]]">
               <history-searched-label title="[[cropItemTitle_(item.title)]]"
                   search-term="[[searchTerm]]"></history-searched-label>
             </a>
             <span id="domain">[[item.domain]]</span>
           </div>
           <button is="paper-icon-button-light" id="bookmark-star"
               title="$i18n{removeBookmark}" on-tap="onRemoveBookmarkTap_">
             <iron-icon icon="cr:star"></iron-icon>
           </button>
           <button is="paper-icon-button-light" id="menu-button"
               class="icon-button" title="$i18n{moreActionsButton}"
               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>
     </div>
   </template>
   <script src="chrome://history/history_item.js"></script>
 </dom-module>