Add browser_test for extension app API with missing schema

chrome/browser/extensions/stubs_apitest.cc

Index: chrome/browser/extensions/stubs_apitest.cc
diff --git a/chrome/browser/extensions/stubs_apitest.cc b/chrome/browser/extensions/stubs_apitest.cc
index 24c4d89fa0e30217d2af93161efb355e9922d7a9..03f920177c678465405b69fcdb186ba32554edf3 100644
--- a/chrome/browser/extensions/stubs_apitest.cc
+++ b/chrome/browser/extensions/stubs_apitest.cc
@@ -29,3 +29,12 @@ IN_PROC_BROWSER_TEST_F(ExtensionApiTest, MAYBE_Stubs) {
   ResultCatcher catcher;
   ASSERT_TRUE(catcher.GetNextResult());
 }
+
+// Tests that all API features that are available to a platform app actually
+// can be used in an app. For example, this test will fail if a developer adds
+// an API feature without providing a schema. http://crbug.com/369318
+IN_PROC_BROWSER_TEST_F(ExtensionApiTest, StubsApp) {
+  ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
+
+  ASSERT_TRUE(RunPlatformAppTest("stubs_app")) << message_;
+}