Focus the history group that was clicked.

chrome/browser/resources/history/history.js

 // Copyright (c) 2012 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.
 
 <include src="../uber/uber_utils.js">
 <include src="history_focus_manager.js">
 
 ///////////////////////////////////////////////////////////////////////////////
 // Globals:
 /** @const */ var RESULTS_PER_PAGE = 150;
@@ skipping 1784 matching lines @@
     // the height to auto so that it is computed and then set it to the
     // computed value in pixels so the transition works properly.
     var height = innerResultList.clientHeight;
     innerResultList.style.height = 0;
     setTimeout(function() {
       innerResultList.style.height = height + 'px';
     }, 0);
   }
 
   entry.classList.toggle('expand');
+
+  var row = entry.querySelector('.site-domain-wrapper');
+  var activeRows =
+      this.resultDiv_.getElementsByClassName(cr.ui.FocusRow.ACTIVE_CLASS);
+  for (var i = 0; i < activeRows.length; ++i) {
+    if (activeRows[i] != row) // Ignore |row| to avoid flicker.
+      activeRows[i].makeActive(false);
+  }
+  row.makeActive(true);
+
   this.updateFocusGrid_();
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 // State object:
 /**
  * An 'AJAX-history' implementation.
  * @param {HistoryModel} model The model we're representing.
  * @param {HistoryView} view The view we're representing.
  * @constructor
@@ skipping 584 matching lines @@
     historyView.reload();
 }
 
 // Add handlers to HTML elements.
 document.addEventListener('DOMContentLoaded', load);
 
 // This event lets us enable and disable menu items before the menu is shown.
 document.addEventListener('canExecute', function(e) {
   e.canExecute = true;
 });