App windows with ids should remember fullscreen state.

chrome/test/data/extensions/platform_apps/restore_state/test.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.
 
 var assertState = function(win) {
   if (win.id == 'normal') {
     chrome.test.assertFalse(win.isMinimized());
     chrome.test.assertFalse(win.isMaximized());
+    chrome.test.assertFalse(win.isFullscreen());
   }
   if (win.id == 'maximized') {
     chrome.test.assertFalse(win.isMinimized());
     chrome.test.assertTrue(win.isMaximized());
+    chrome.test.assertFalse(win.isFullscreen());
+  }
+  if (win.id == 'fullscreen') {
+    chrome.test.assertFalse(win.isMinimized());
+    chrome.test.assertFalse(win.isMaximized());
+    chrome.test.assertTrue(win.isFullscreen());
   }
 }
 
 var testRestoreState = function(state_type) {
   chrome.app.window.create(
     'empty.html',
     { id: state_type, state: state_type },
     chrome.test.callbackPass(windowCreated)
   );
   function windowCreated(win) {
@@ skipping 11 matching lines @@
 }
 
 chrome.app.runtime.onLaunched.addListener(function() {
   chrome.test.runTests([
     function testRestoreNormal() {
       testRestoreState('normal');
     },
     function testRestoreMaximized() {
       testRestoreState('maximized');
     },
+    function testRestoreFullscreen() {
+      testRestoreState('fullscreen');
+    },
     // Minimize and fullscreen behavior are platform dependent.
   ]);
 });