Respect policy for list of startup pages

chrome/browser/resources/options2/startup_overlay.js

Index: chrome/browser/resources/options2/startup_overlay.js
diff --git a/chrome/browser/resources/options2/startup_overlay.js b/chrome/browser/resources/options2/startup_overlay.js
index 36878e6589735095a1d628e07ec96cd1106ca6de..086ccdc64a762f0b4363bd75dec9904268a528e5 100644
--- a/chrome/browser/resources/options2/startup_overlay.js
+++ b/chrome/browser/resources/options2/startup_overlay.js
@@ -33,6 +33,11 @@ cr.define('options', function() {
      */
     autocompleteList_: null,
 
+    startup_pages_pref_: {
+      'name': 'session.urls_to_restore_on_startup',
+      'disabled': false
+    },
+
     /**
      * Initialize the page.
      */
@@ -49,6 +54,10 @@ cr.define('options', function() {
         chrome.send('setStartupPagesToCurrentPages');
       };
 
+      Preferences.getInstance().addEventListener(
+          this.startup_pages_pref_.name,
+          this.handleStartupPageListChange_.bind(this));
+
       var suggestionList = new cr.ui.AutocompleteList();
       suggestionList.autoExpands = true;
       suggestionList.suggestionUpdateRequestCallback =
@@ -71,6 +80,34 @@ cr.define('options', function() {
     },
 
     /**
+     * Sets the enabled state of the custom startup page list controls
+     * based on the current startup radio button selection.
+     * @private
+     */
+    updateCustomStartupPageControlStates_: function() {
+      var disable = this.startup_pages_pref_.disabled;
+      var startupPagesList = $('startupPagesList');
+      startupPagesList.disabled = disable;
+      startupPagesList.setAttribute('tabindex', disable ? -1 : 0);
+      // Explicitly set disabled state for input text elements.
+      var inputs = startupPagesList.querySelectorAll("input[type='text']");
+      for (var i = 0; i < inputs.length; i++)
+        inputs[i].disabled = disable;
+      $('startupUseCurrentButton').disabled = disable;
+    },
+
+    /**
+     * Handles change events of the preference
+     * 'session.urls_to_restore_on_startup'.
+     * @param {event} preference changed event.
+     * @private
+     */
+    handleStartupPageListChange_: function(event) {
+      this.startup_pages_pref_.disabled = event.value['disabled'];
+      this.updateCustomStartupPageControlStates_();
+    },
+
+    /**
      * Updates the startup pages list with the given entries.
      * @param {Array} pages List of startup pages.
      * @private