Introduce lock screen app manager interface

chrome/browser/chromeos/lock_screen_apps/app_manager_impl.h

+// Copyright 2017 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_LOCK_SCREEN_APPS_APP_MANAGER_IMPL_H_
+#define CHROME_BROWSER_CHROMEOS_LOCK_SCREEN_APPS_APP_MANAGER_IMPL_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "chrome/browser/chromeos/lock_screen_apps/app_manager.h"
+
+class Profile;
+
+namespace lock_screen_apps {
+
+// The default implementation of lock_screen_apps::AppManager.
+class AppManagerImpl : public AppManager {
+ public:
+  AppManagerImpl();
+  ~AppManagerImpl() override;
+
+  // AppManager implementation:
+  void Initialize(Profile* primary_profile,
+                  Profile* lock_screen_profile) override;
+  void Start(const base::Closure& note_taking_changed_callback) override;
+  void Stop() override;
+  bool LaunchNoteTaking() override;
+  bool IsNoteTakingAppAvailable() const override;
+  std::string GetNoteTakingAppId() const override;
+
+ private:
+  Profile* primary_profile_ = nullptr;
+  Profile* lock_screen_profile_ = nullptr;
+
+  base::Closure note_taking_changed_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppManagerImpl);
+};
+
+}  // namespace lock_screen_apps
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOCK_SCREEN_APPS_APP_MANAGER_IMPL_H_