App windows with ids should remember fullscreen state.

chrome/test/data/extensions/platform_apps/restore_state/test.js

Index: chrome/test/data/extensions/platform_apps/restore_state/test.js
diff --git a/chrome/test/data/extensions/platform_apps/restore_state/test.js b/chrome/test/data/extensions/platform_apps/restore_state/test.js
index d7497bed7f5eb348d4a6b193b20908c4e0b66158..245c4dcf34fef97d393c7ab3c0b352f5e3bd73f7 100644
--- a/chrome/test/data/extensions/platform_apps/restore_state/test.js
+++ b/chrome/test/data/extensions/platform_apps/restore_state/test.js
@@ -6,10 +6,17 @@ 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());
   }
 }
 
@@ -41,6 +48,9 @@ chrome.app.runtime.onLaunched.addListener(function() {
     function testRestoreMaximized() {
       testRestoreState('maximized');
     },
+    function testRestoreFullscreen() {
+      testRestoreState('fullscreen');
+    },
     // Minimize and fullscreen behavior are platform dependent.
   ]);
 });