Fetch ARC Kiosk app name and icon from Android side.

chrome/browser/chromeos/app_mode/kiosk_app_data_base.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_APP_MODE_KIOSK_APP_DATA_BASE_H_
+#define CHROME_BROWSER_CHROMEOS_APP_MODE_KIOSK_APP_DATA_BASE_H_
+
+#include <string>
+
+#include "base/files/file_path.h"
+#include "chrome/browser/chromeos/app_mode/kiosk_app_icon_loader.h"
+#include "components/prefs/scoped_user_pref_update.h"
+#include "components/signin/core/account_id/account_id.h"
+#include "ui/gfx/image/image_skia.h"
+
+namespace base {
+class DictionaryValue;
+}
+
+namespace chromeos {
+
+class KioskAppDataBase : public KioskAppIconLoader::Delegate {
+ public:
+  // Dictionary key for apps.
+  static const char kKeyApps[];
+
+  const std::string& dictionary_name() const { return dictionary_name_; }
+  const std::string& app_id() const { return app_id_; }
+  const AccountId& account_id() const { return account_id_; }
+  const std::string& name() const { return name_; }
+  const gfx::ImageSkia& icon() const { return icon_; }
+
+  // Callbacks for KioskAppIconLoader.
+  void OnIconLoadSuccess(const gfx::ImageSkia& icon) override = 0;
+  void OnIconLoadFailure() override = 0;
+
+  // Clears locally cached data.
+  void ClearCache();
+
+ protected:
+  KioskAppDataBase(const std::string& dictionary_name,
+                   const std::string& app_id,
+                   const AccountId& account_id);
+  ~KioskAppDataBase() override;
+
+  // Helper to save name and icon to provided dictionary.
+  void SaveToDictionary(DictionaryPrefUpdate& dict_update);
+
+  // Helper to load name and icon from provided dictionary.
+  bool LoadFromDictionary(const base::DictionaryValue* dict);

[xiyuan, 2017/03/31 15:10:02]

nit: prevailing style is to use & with const, i.e. const base::DictionaryValue&

[Sergey Poromov, 2017/03/31 18:38:58]

Done.

+
+  // Helper to cache |icon| to |cache_dir|.
+  void SaveIcon(const SkBitmap& icon, const base::FilePath& cache_dir);
+
+  std::string name_;

[xiyuan, 2017/03/31 15:10:02]

nit: Put a comment about why these are in protected,
e.g. "In protected section to allow derived classes to modify.".

[Sergey Poromov, 2017/03/31 18:38:58]

Done.

+  gfx::ImageSkia icon_;
+
+  // Should be released when callbacks are called.
+  std::unique_ptr<KioskAppIconLoader> kiosk_app_icon_loader_;

[xiyuan, 2017/03/31 15:10:02]

nit: #include <memory>

[Sergey Poromov, 2017/03/31 18:38:58]

Done.

+
+ private:
+  // Name of a dictionary that holds kiosk app info in Local State.
+  const std::string dictionary_name_;
+
+  const std::string app_id_;
+  const AccountId account_id_;
+
+  base::FilePath icon_path_;
+
+  DISALLOW_COPY_AND_ASSIGN(KioskAppDataBase);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_APP_MODE_KIOSK_APP_DATA_BASE_H_