Add on_startup_page/compiled_resources.gyp

chrome/browser/resources/settings/on_startup_page/on_startup_page.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.
 
 /**
  * @fileoverview
  * 'cr-settings-on-startup-page' is a settings page.
  *
  * Example:
  *
@@ skipping 67 matching lines @@
 
     prefValue: {
       type: Number,
     }
   },
 
   observers: [
     'prefValueChanged(prefValue)',
   ],
 
+  /** @override */
   attached: function() {
-    this.prefValue = this.prefs.session.restore_on_startup.value;
-  },
-
-  prefValueChanged: function(prefValue) {
-    this.set('prefs.session.restore_on_startup.value', parseInt(prefValue));
+    var restoreOnStartup =
+          this.get('session.restore_on_startup.value', this.prefs);
+    if (restoreOnStartup != undefined)
+      this.prefValue = /** @type {number} */(restoreOnStartup);
   },
 
   /** @private */
+  prefValueChanged: function(prefValue) {
+    this.set('prefs.session.restore_on_startup.value', parseInt(prefValue, 10));
+  },
+
+  /** @private */
   onBackTap_: function() {
     this.$.pages.back();
   },
 
   /** @private */
   onSetPagesTap_: function() {
-    this.$.pages.navigateTo('startup-urls');
+    this.$.pages.setSubpageChain(['startup-urls']);
   },
 });