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

chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_launcher.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_LAUNCHER_H_
+#define CHROME_BROWSER_CHROMEOS_APP_MODE_ARC_ARC_KIOSK_APP_LAUNCHER_H_
+
+#include "chrome/browser/ui/app_list/arc/arc_app_list_prefs.h"
+#include "ui/aura/env_observer.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_observer.h"
+
+namespace chromeos {
+
+// Starts Android app in kiosk mode.
+// Keeps track of start progress and pins app window
+// when it's finally opened.
+class ArcKioskAppLauncher : public ArcAppListPrefs::Observer,
+                            public aura::EnvObserver,
+                            public aura::WindowObserver {
+ public:
+  ArcKioskAppLauncher(content::BrowserContext* context,
+                      const std::string& app_id);
+
+  ~ArcKioskAppLauncher() override;
+
+  // ArcAppListPrefs::Observer overrides.
+  void OnTaskCreated(int32_t task_id,
+                     const std::string& package_name,
+                     const std::string& activity) override;
+
+  // aura::EnvObserver overrides.
+  void OnWindowInitialized(aura::Window* window) override;
+
+  // aura::WindowObserver overrides.
+  void OnWindowPropertyChanged(aura::Window* window,
+                               const void* key,
+                               intptr_t old) override;
+  void OnWindowDestroying(aura::Window* window) override;
+
+ private:
+  bool CheckWindow(aura::Window* const window);

[Nikita (slow), 2016/11/16 15:33:28]

nit: method comment

[Sergey Poromov, 2016/11/16 15:54:09]

Done.

+  void StopObserving();
+
+  std::string app_id_;
+  ArcAppListPrefs* prefs_;
+  int task_id_ = -1;
+  std::set<aura::Window*> windows_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcKioskAppLauncher);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_APP_MODE_ARC_ARC_KIOSK_APP_LAUNCHER_H_