Add support for transparent background API

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

Index: chrome/browser/extensions/api/app_window/app_window_apitest.cc
diff --git a/chrome/browser/extensions/api/app_window/app_window_apitest.cc b/chrome/browser/extensions/api/app_window/app_window_apitest.cc
index 5b20a4226b85d87f31c8734628324d0d1f95ba6e..2a6114b92190ec3ae2b179701d413cd207a5f75d 100644
--- a/chrome/browser/extensions/api/app_window/app_window_apitest.cc
+++ b/chrome/browser/extensions/api/app_window/app_window_apitest.cc
@@ -105,4 +105,36 @@ IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, WindowsApiGet) {
       << 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