Add support for transparent background API

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

Index: chrome/test/data/extensions/platform_apps/windows_api_alpha_enabled/has_permissions_has_alpha/background.js
diff --git a/chrome/test/data/extensions/platform_apps/windows_api_alpha_enabled/has_permissions_has_alpha/background.js b/chrome/test/data/extensions/platform_apps/windows_api_alpha_enabled/has_permissions_has_alpha/background.js
new file mode 100644
index 0000000000000000000000000000000000000000..5e96e0a4a51692f8bd2747e7bb588b0d50c708ed
--- /dev/null
+++ b/chrome/test/data/extensions/platform_apps/windows_api_alpha_enabled/has_permissions_has_alpha/background.js
@@ -0,0 +1,42 @@
+// 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.
+
+function testAlphaEnabled(testId, setOption, setValue, expectedValue) {
+  var createOptions = { };
+  if (setOption)
+    createOptions.alphaEnabled = setValue;
+
+  chrome.app.window.create('index.html',
+                           createOptions,
+                           chrome.test.callbackPass(function(win) {
+      chrome.test.assertEq(expectedValue, win.alphaEnabled());
+  }));
+}
+
+// All these tests are run with app.window.alpha permission
+// set and on a system with alpha (transparency) support.
+
+chrome.app.runtime.onLaunched.addListener(function() {
+  chrome.test.runTests([
+
+    // Window is created with alphaEnabled set to true.
+    function testAlphaEnabledPermTransInitTrue() {
+      testAlphaEnabled('testAlphaEnabledPermTransInitTrue',
+                       true, true, true);
+    },
+
+    // Window is created with alphaEnabled set to false.
+    function testAlphaEnabledPermTransInitFalse() {
+      testAlphaEnabled('testAlphaEnabledPermTransInitFalse',
+                       true, false, false);
+    },
+
+    // Window is created with alphaEnabled not explicitly set.
+    function testAlphaEnabledPermTransNoInit() {
+      testAlphaEnabled('testAlphaEnabledPermTransNoInit',
+                       false, false, false);
+    }
+
+  ]);
+});