[MD History] Focus the search bar on load.

chrome/browser/resources/md_history/app.js

 // Copyright 2016 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-app',
 
   properties: {
     showSidebarFooter: Boolean,
 
@@ skipping 36 matching lines @@
       }
     },
 
     // Route data for the current page.
     routeData_: Object,
 
     // The query params for the page.
     queryParams_: Object,
 
     // True if the window is narrow enough for the page to have a drawer.
-    hasDrawer_: Boolean,
+    hasDrawer: Boolean,
   },
 
   observers: [
     // routeData_.page <=> selectedPage
     'routeDataChanged_(routeData_.page)',
     'selectedPageChanged_(selectedPage_)',
 
     // queryParams_.q <=> queryState.searchTerm
     'searchTermChanged_(queryState_.searchTerm)',
     'searchQueryParamChanged_(queryParams_.q)',
@@ skipping 68 matching lines @@
   historyResult: function(info, results) {
     this.set('queryState_.querying', false);
     this.set('queryResult_.info', info);
     this.set('queryResult_.results', results);
     var listContainer =
         /** @type {HistoryListContainerElement} */ (this.$['history']);
     listContainer.historyResult(info, results);
   },
 
   /**
+   * Focuses the search bar in the toolbar.
+   */
+  focusToolbarSearchField: function() {
+    this.$.toolbar.showSearchField();
+  },
+
+  /**
    * Fired when the user presses 'More from this site'.
    * @param {{detail: {domain: string}}} e
    */
   searchDomain_: function(e) { this.$.toolbar.setSearchTerm(e.detail.domain); },
 
   /**
    * @param {Event} e
    * @private
    */
   onCanExecute_: function(e) {
@@ skipping 27 matching lines @@
   searchQueryParamChanged_: function(searchQuery) {
     this.$.toolbar.setSearchTerm(searchQuery || '');
   },
 
   /**
    * @param {Event} e
    * @private
    */
   onCommand_: function(e) {
     if (e.command.id == 'find-command' || e.command.id == 'slash-command')
-      this.$.toolbar.showSearchField();
+      this.focusToolbarSearchField();
     if (e.command.id == 'delete-command')
       this.deleteSelected();
   },
 
   /**
    * @param {!Array<!ForeignSession>} sessionList Array of objects describing
    *     the sessions from other devices.
    * @param {boolean} isTabSyncEnabled Is tab sync enabled for this profile?
    */
   setForeignSessions: function(sessionList, isTabSyncEnabled) {
@@ skipping 72 matching lines @@
     return selectedPage;
   },
 
   /** @private */
   closeDrawer_: function() {
     var drawer = this.$$('#drawer');
     if (drawer)
       drawer.close();
   },
 });