[MD History] Focus the search bar on load.

chrome/browser/resources/md_history/app.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/cr/ui.html">
 <link rel="import" href="chrome://resources/html/cr/ui/command.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/app-layout/app-drawer/app-drawer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/app-route/app-location.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/app-route/app-route.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-media-query/iron-media-query.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-pages/iron-pages.html">
 <link rel="import" href="chrome://history/history_toolbar.html">
 <link rel="import" href="chrome://history/list_container.html">
@@ skipping 56 matching lines @@
     </app-route>
     <history-toolbar id="toolbar"
         spinner-active="[[shouldShowSpinner_(queryState_.querying,
                                              queryState_.incremental,
                                              queryState_.searchTerm)]]"
         is-grouped-mode="{{grouped_}}"
         grouped-range="{{queryState_.range}}"
         search-term="{{queryState_.searchTerm}}"
         query-start-time="[[queryResult_.info.queryStartTime]]"
         query-end-time="[[queryResult_.info.queryEndTime]]"
-        has-drawer="[[hasDrawer_]]">
+        has-drawer="[[hasDrawer]]">
     </history-toolbar>
 
     <div id="main-container">
       <history-side-bar id="content-side-bar" selected-page="[[selectedPage_]]"
           route="[[route_]]" show-footer="[[showSidebarFooter]]"
-          hidden$="[[hasDrawer_]]">
+          hidden$="[[hasDrawer]]">
       </history-side-bar>
       <iron-pages id="content" attr-for-selected="path"
           fallback-selection="history"
           selected="[[getSelectedPage_(selectedPage_, items)]]"
           items="{{items}}">
         <history-list-container id="history" query-state="{{queryState_}}"
             query-result="[[queryResult_]]" grouped="[[grouped_]]"
             path="history">
         </history-list-container>
         <template is="dom-if" if="[[syncedTabsSelected_(selectedPage_)]]">
           <history-synced-device-manager id="synced-devices"
               session-list="[[queryResult_.sessionList]]"
               search-term=[[queryState_.searchTerm]]
               path="syncedTabs">
           </history-synced-device-manager>
         </template>
       </iron-pages>
     </div>
 
-    <template is="dom-if" if="[[hasDrawer_]]">
+    <template is="dom-if" if="[[hasDrawer]]">
       <app-drawer id="drawer" swipe-open align="start" tabindex="0">
         <div id="drawer-header">
           <h1>$i18n{title}</h1>
         </div>
         <history-side-bar id="drawer-side-bar" selected-page="[[selectedPage_]]"
             route="[[route_]]" show-footer="[[showSidebarFooter]]" drawer>
         </history-side-bar>
       </app-drawer>
     </template>
 
     <iron-media-query query="(max-width: 1023px)"
-        query-matches="{{hasDrawer_}}">
+        query-matches="{{hasDrawer}}">
     </iron-media-query>
   </template>
   <script src="chrome://history/app.js"></script>
 </dom-module>