Handle Escape key on constrained window.

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"/>
 
@@ skipping 607 matching lines @@
     },
 
     /**
      * Consume escape key presses and ctrl + shift + p. Delegate everything else
      * to the preview area.
      * @param {KeyboardEvent} e The keyboard event.
      * @private
      */
     onKeyDown_: function(e) {
       // Escape key closes the dialog.
+      // <if expr="not pp_ifdef('toolkit_views')">
+      // On the toolkit_views environment, ESC key is handled by C++-side
+      // instead of JS-side.
       if (e.keyCode == 27 && !e.shiftKey && !e.ctrlKey && !e.altKey &&
           !e.metaKey) {
         if (this.destinationSearch_.getIsVisible()) {
           this.destinationSearch_.setIsVisible(false);
           this.metrics_.increment(
               print_preview.Metrics.Bucket.DESTINATION_SELECTION_CANCELED);
         } else {
           this.close_();
         }
         e.preventDefault();
         return;
       }
+      // </if>
 
       // Ctrl + Shift + p / Mac equivalent.
       if (e.keyCode == 80) {
         if ((cr.isMac && e.metaKey && e.altKey && !e.shiftKey && !e.ctrlKey) ||
             (!cr.isMac && e.shiftKey && e.ctrlKey && !e.altKey && !e.metaKey)) {
           this.openSystemPrintDialog_();
           e.preventDefault();
           return;
         }
       }
@@ skipping 148 matching lines @@
 <include src="search/cloud_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();
 });