add a test app using notification provider API

chrome/test/data/extensions/api_test/notification_provider/test_app/app.js

Index: chrome/test/data/extensions/api_test/notification_provider/test_app/app.js
diff --git a/ui/native_theme/native_theme_observer.cc b/chrome/test/data/extensions/api_test/notification_provider/test_app/app.js
similarity index 50%
copy from ui/native_theme/native_theme_observer.cc
copy to chrome/test/data/extensions/api_test/notification_provider/test_app/app.js
index f516a762027fccab32d569f2466d82c65252c104..f7cef878f9f49c9fc5c7e12f8241569be96e16db 100644
--- a/ui/native_theme/native_theme_observer.cc
+++ b/chrome/test/data/extensions/api_test/notification_provider/test_app/app.js
@@ -2,10 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/native_theme/native_theme_observer.h"
-
-namespace ui {
-
-NativeThemeObserver::~NativeThemeObserver() {}
-
-}  // namespace ui
+chrome.app.runtime.onLaunched.addListener(function () {
+  chrome.app.window.create("window.html", {
+    id: "mainwin",
+    bounds: {width:600, height:1000}
+  });
+});