Add support for transparent background API

chrome/browser/extensions/api/app_window/app_window_apitest.cc

 // 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.
 
 #include "apps/app_window.h"
 #include "apps/app_window_registry.h"
 #include "apps/ui/native_app_window.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/apps/app_browsertest_util.h"
@@ skipping 87 matching lines @@
                        WindowsApiAlwaysOnTopNoPermissions) {
   EXPECT_TRUE(RunPlatformAppTest(
       "platform_apps/windows_api_always_on_top/no_permissions")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, WindowsApiGet) {
   EXPECT_TRUE(RunPlatformAppTest("platform_apps/windows_api_get"))
       << message_;
 }
 
+IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest,
+                       WindowsApiAlphaEnabledHasPermissions) {
+#if defined(USE_AURA)
+  EXPECT_TRUE(RunPlatformAppTest(
+      "platform_apps/windows_api_alpha_enabled/has_permissions_aura"))
+      << message_;
+#else
+  EXPECT_TRUE(RunPlatformAppTest(
+      "platform_apps/windows_api_alpha_enabled/has_permissions_no_aura"))
+      << message_;
+#endif
+}
+
+IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest,
+                       WindowsApiAlphaEnabledNoPermissions) {
+  EXPECT_TRUE(RunPlatformAppTest(
+      "platform_apps/windows_api_alpha_enabled/no_permissions"))
+      << message_;
+}
+
+#ifdef USE_AURA
+IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, WindowsApiAlphaEnabledInStable) {
+  extensions::ScopedCurrentChannel channel(chrome::VersionInfo::CHANNEL_STABLE);
+  EXPECT_TRUE(RunPlatformAppTestWithFlags(
+      "platform_apps/windows_api_alpha_enabled/in_stable",
+      // Ignore manifest warnings because the extension will not load at all
+      // in stable.
+      kFlagIgnoreManifestWarnings))
+      << message_;
+}
+#endif
+
 }  // namespace extensions