arc: Add Arc Kiosk app service and ability to launch kiosk apps.

chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service.h

+// Copyright 2016 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_APP_MODE_ARC_ARC_KIOSK_APP_SERVICE_H_
+#define CHROME_BROWSER_CHROMEOS_APP_MODE_ARC_ARC_KIOSK_APP_SERVICE_H_
+
+#include "base/macros.h"
+#include "chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_launcher.h"
+#include "chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_manager.h"
+#include "chrome/browser/ui/app_list/arc/arc_app_list_prefs.h"
+#include "components/keyed_service/core/keyed_service.h"
+#include "components/prefs/pref_change_registrar.h"
+#include "content/public/browser/browser_context.h"
+
+namespace chromeos {
+
+// Keeps track of ARC session state and auto-launches kiosk app when it's ready.
+// App is started when the following conditions are satisfied:
+// 1. App id is registered in ArcAppListPrefs and set to "ready" state.
+// 2. Got empty policy compliance report from Android
+// 3. App is not yet started
+// Also, the app is stopped when one of above conditions changes.
+class ArcKioskAppService
+    : public KeyedService,
+      public ArcAppListPrefs::Observer,
+      public ArcKioskAppManager::ArcKioskAppManagerObserver {
+ public:
+  static ArcKioskAppService* Create(Profile* profile, ArcAppListPrefs* prefs);
+  static ArcKioskAppService* Get(content::BrowserContext* context);
+
+  // ArcAppListPrefs::Observer overrides
+  void OnAppRegistered(const std::string& app_id,
+                       const ArcAppListPrefs::AppInfo& app_info) override;
+  void OnAppReadyChanged(const std::string& id, bool ready) override;
+  void OnTaskCreated(int32_t task_id,
+                     const std::string& package_name,
+                     const std::string& activity) override;
+  void OnTaskDestroyed(int32_t task_id) override;
+  void OnPackageListInitialRefreshed() override;
+
+  // ArcKioskAppManager::Observer overrides
+  void OnArcKioskAppsChanged() override;
+
+ private:
+  ArcKioskAppService(Profile* profile, ArcAppListPrefs* prefs);
+  ~ArcKioskAppService();
+
+  std::string GetAppId();
+  void MaybeStartOrStopKioskApp();

[Luis Héctor Chávez, 2016/11/16 16:37:12]

Consider renaming it "PreconditionsChanged" to reduce the uncertainty in the
name, and add a small comment referring to the documentation block at the
beginning of the class.

[Sergey Poromov, 2016/11/16 17:42:14]

Done.

+
+  Profile* const profile_;
+  ArcAppListPrefs* const prefs_;
+  ArcKioskAppManager* app_manager_;
+  std::string app_id_;
+  std::unique_ptr<ArcAppListPrefs::AppInfo> app_info_;
+  int32_t task_id_ = -1;
+  std::unique_ptr<PrefChangeRegistrar> pref_change_registrar_;
+  // Keeps track whether the app is already launched
+  std::unique_ptr<ArcKioskAppLauncher> app_launcher_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcKioskAppService);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_APP_MODE_ARC_ARC_KIOSK_APP_SERVICE_H_