Add support for transparent background API

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

Index: chrome/test/data/extensions/platform_apps/windows_api_alpha_enabled/in_stable/background.js
diff --git a/chrome/test/data/extensions/platform_apps/windows_api_alpha_enabled/in_stable/background.js b/chrome/test/data/extensions/platform_apps/windows_api_alpha_enabled/in_stable/background.js
new file mode 100644
index 0000000000000000000000000000000000000000..5aa6e89494ff589ff161374deb0c9cfb7c8970aa
--- /dev/null
+++ b/chrome/test/data/extensions/platform_apps/windows_api_alpha_enabled/in_stable/background.js
@@ -0,0 +1,33 @@
+// 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.
+
+var error = "The alphaEnabled option requires dev channel or newer.";
+
+function testAlphaEnabled(testId, setValue) {
+  var createOptions = { };
+  createOptions.alphaEnabled = setValue;
+
+  chrome.app.window.create('index.html',
+                           createOptions,
+                           chrome.test.callbackFail(error));
+}
+
+// All these tests are run in Stable channel with app.window.alpha
+// permission set.
+
+chrome.app.runtime.onLaunched.addListener(function() {
+  chrome.test.runTests([
+
+    // Window is created with alphaEnabled set to true.
+    function testAlphaEnabledStableInitTrue() {
+      testAlphaEnabled('testAlphaEnabledStableInitTrue', true);
+    },
+
+    // Window is created with alphaEnabled set to false.
+    function testAlphaEnabledStableInitFalse() {
+      testAlphaEnabled('testAlphaEnabledStableInitFalse', false);
+    },
+
+  ]);
+});