Add always-on-top property to app windows

chrome/test/data/extensions/platform_apps/windows_api_always_on_top/background.js

Index: chrome/test/data/extensions/platform_apps/windows_api_always_on_top/background.js
diff --git a/chrome/test/data/extensions/platform_apps/windows_api_always_on_top/background.js b/chrome/test/data/extensions/platform_apps/windows_api_always_on_top/background.js
new file mode 100644
index 0000000000000000000000000000000000000000..f89a25e6e9ac1a09c4256d8aadba1326a4beb329
--- /dev/null
+++ b/chrome/test/data/extensions/platform_apps/windows_api_always_on_top/background.js
@@ -0,0 +1,42 @@
+// Copyright 2013 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 callbackPass = chrome.test.callbackPass;
+
+function testAlwaysOnTop(testId, initValue) {
+  var options =
+    {
+      id: testId,
+      alwaysOnTop: initValue
+    };
+  chrome.app.window.create('index.html',
+                           options,
+                           callbackPass(function(win) {
+    chrome.test.assertEq(initValue, win.isAlwaysOnTop());
+    win.setAlwaysOnTop(!initValue);
+
+    setTimeout(callbackPass(function() {
+      chrome.test.assertEq(!initValue, win.isAlwaysOnTop());
+      win.contentWindow.close();
+    }), 500);
+  }));
+}
+
+chrome.app.runtime.onLaunched.addListener(function() {
+  chrome.test.runTests([
+
+    // Window is created with always on top enabled, then disabled after
+    // creation.
+    function testAlwaysOnTopInitTrue() {
+      testAlwaysOnTop('testAlwaysOnTopInitTrue', true);
+    },
+
+    // Window is created with always on top disabled, then enabled after
+    // creation.
+    function testAlwaysOnTopInitFalse() {
+      testAlwaysOnTop('testAlwaysOnTopInitFalse', false);
+    }
+
+  ]);
+});