Prevent focus from leaving Print Preview overlay controls.

chrome/browser/resources/print_preview/print_preview.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.
 
 // TODO(rltoscano): Move data/* into print_preview.data namespace
 
 var localStrings = new LocalStrings(templateData);
 
 <include src="component.js"/>
+<include src="print_preview_focus_manager.js"/>
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Container class for Chromium's print preview.
    * @constructor
    * @extends {print_preview.Component}
    */
   function PrintPreview() {
@@ skipping 228 matching lines @@
     __proto__: print_preview.Component.prototype,
 
     /** Sets up the page and print preview by getting the printer list. */
     initialize: function() {
       this.decorate($('print-preview'));
       i18nTemplate.process(document, templateData);
       if (!this.previewArea_.hasCompatiblePlugin) {
         this.setIsEnabled_(false);
       }
       this.nativeLayer_.startGetInitialSettings();
+      print_preview.PrintPreviewFocusManager.getInstance().initialize();
       cr.ui.FocusOutlineManager.forDocument(document);
     },
 
     /** @override */
     enterDocument: function() {
       // Native layer events.
       this.tracker.add(
           this.nativeLayer_,
           print_preview.NativeLayer.EventType.INITIAL_SETTINGS_SET,
           this.onInitialSettingsSet_.bind(this));
@@ skipping 918 matching lines @@
 <include src="search/recent_destination_list.js"/>
 <include src="search/destination_list_item.js"/>
 <include src="search/destination_search.js"/>
 <include src="search/search_box.js"/>
 <include src="search/fedex_tos.js"/>
 
 window.addEventListener('DOMContentLoaded', function() {
   printPreview = new print_preview.PrintPreview();
   printPreview.initialize();
 });