[GTK] Report isMinimized and correctly restore app windows.

chrome/test/data/extensions/platform_apps/windows_api_properties/main.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 current = chrome.app.window.current();
 var bg = null;
 var nextTestNumber = 1;
 
 function makeEventTest(eventName, startFunction) {
   var test = function() {
@@ skipping 21 matching lines @@
   return test;
 }
 
 
 var tests = [
 
   makeEventTest('onMinimized', function() { current.minimize(); }),
   makeEventTest('onMaximized', function() { current.maximize(); }),
   makeEventTest('onRestored', function() {
     current.minimize();
-    current.restore();
+    current['onMinimized'].addListener(function() {
+      current.restore();
+    });
   }),
   makeEventTest('onRestored', function() {
     current.maximize();
-    current.restore();
+    // Don't call |restore| immediately. On GTK+ platform the restore method
+    // will depend on the previous window state.
+    current['onMaximized'].addListener(function() {
+      current.restore();
+    })
   }),
   makeEventTest('onBoundsChanged', function() {
     current.setBounds({left:5, top:5, width:100, height:100});
   })
 
 ];
 
 chrome.runtime.getBackgroundPage(function(page) {
   bg = page;
   chrome.test.runTests(tests);
 });