Add AppWindow.setVisibleOnAllWorkspaces.

chrome/test/data/extensions/platform_apps/windows_api_visible_on_all_workspaces/in_stable/background.js

+// Copyright 2014 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.
+
+// All these tests are run in Stable channel.
+
+var error = "The visibleOnAllWorkspaces option requires dev channel or newer.";
+
+chrome.app.runtime.onLaunched.addListener(function() {
+  chrome.test.runTests([
+
+    // Check CreateWindowOptions.visibleOnAllWorkspaces().
+    function testCreateOption() {
+      chrome.app.window.create(
+          'index.html', {
+            visibleOnAllWorkspaces: true,
+          }, chrome.test.callbackFail(error));
+    },
+
+    // Check chrome.app.window.canSetVisibleOnAllWorkspaces().
+    function testCanSetVisibleOnAllWorkspaces() {
+      chrome.test.assertTrue(
+          chrome.app.window.canSetVisibleOnAllWorkspaces === undefined);
+      chrome.test.callbackPass(function () {})();
+    },
+
+  ]);
+});