[MD History] Focus the search bar on load.

chrome/browser/resources/md_history/history.js

 // Copyright 2015 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.
 
 // Send the history query immediately. This allows the query to process during
 // the initial page startup.
 chrome.send('queryHistory', ['', 0, 0, 0, RESULTS_PER_PAGE]);
 chrome.send('getForeignSessions');
 
 /** @type {Promise} */
@@ skipping 33 matching lines @@
 
     if (!resultsRendered) {
       resultsRendered = true;
       // requestAnimationFrame allows measurement immediately before the next
       // repaint, but after the first page of <iron-list> items has stamped.
       requestAnimationFrame(function() {
         chrome.send(
             'metricsHandler:recordTime',
             ['History.ResultsRenderedTime', window.performance.now()]);
       });
+
+      // Focus the search field on load. Done here to ensure the history page
+      // is rendered before we try to take focus.
+      $('history-app').focusToolbarSearchField();
     }
   });
 }
 
 /**
  * Called by the history backend after receiving results and after discovering
  * the existence of other forms of browsing history.
  * @param {boolean} hasSyncedResults Whether there are synced results.
  * @param {boolean} includeOtherFormsOfBrowsingHistory Whether to include
  *     a sentence about the existence of other forms of browsing history.
@@ skipping 36 matching lines @@
 /**
  * Called by the history backend after user's sign in state changes.
  * @param {boolean} isUserSignedIn Whether user is signed in or not now.
  */
 function updateSignInState(isUserSignedIn) {
   waitForAppUpgrade().then(function() {
     /** @type {HistoryAppElement} */($('history-app'))
         .updateSignInState(isUserSignedIn);
   });
 }