Make AppWindowWaiter a common test support

chrome/browser/chromeos/login/test/app_window_waiter.h

-// 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.
-
-#ifndef CHROME_BROWSER_CHROMEOS_LOGIN_TEST_APP_WINDOW_WAITER_H_
-#define CHROME_BROWSER_CHROMEOS_LOGIN_TEST_APP_WINDOW_WAITER_H_
-
-#include <memory>
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/run_loop.h"
-#include "extensions/browser/app_window/app_window_registry.h"
-
-namespace extensions {
-class AppWindow;
-}
-
-namespace chromeos {
-
-// Helper class that monitors app windows to wait for a window to appear.
-// Use a new instance for each use, one instance will only work for one Wait.
-class AppWindowWaiter : public extensions::AppWindowRegistry::Observer {
- public:
-  AppWindowWaiter(extensions::AppWindowRegistry* registry,
-                  const std::string& app_id);
-  ~AppWindowWaiter() override;
-
-  // Waits for an AppWindow of the app to be added.
-  extensions::AppWindow* Wait();
-
-  // Waits for an AppWindow of the app to be shown.
-  extensions::AppWindow* WaitForShown();
-
-  // AppWindowRegistry::Observer:
-  void OnAppWindowAdded(extensions::AppWindow* app_window) override;
-  void OnAppWindowShown(extensions::AppWindow* app_window,
-                        bool was_hidden) override;
-
- private:
-  enum WaitType {
-    WAIT_FOR_NONE,
-    WAIT_FOR_ADDED,
-    WAIT_FOR_SHOWN,
-  };
-
-  extensions::AppWindowRegistry* const registry_;
-  const std::string app_id_;
-  std::unique_ptr<base::RunLoop> run_loop_;
-  WaitType wait_type_ = WAIT_FOR_NONE;
-  extensions::AppWindow* window_ = nullptr;
-
-  DISALLOW_COPY_AND_ASSIGN(AppWindowWaiter);
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_TEST_APP_WINDOW_WAITER_H_