kiosk: Add kiosk.always_update manifest key

extensions/common/manifest_handlers/kiosk_mode_info.h

 // Copyright 2013 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 EXTENSIONS_COMMON_MANIFEST_HANDLERS_KIOSK_MODE_INFO_H_
 #define EXTENSIONS_COMMON_MANIFEST_HANDLERS_KIOSK_MODE_INFO_H_
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest.h"
 #include "extensions/common/manifest_handler.h"
 
 namespace extensions {
 
 struct KioskModeInfo : public Extension::ManifestData {
  public:
   enum KioskStatus {
     NONE,
     ENABLED,
     ONLY
   };
 
   KioskModeInfo(KioskStatus kiosk_status,
                 const std::vector<std::string>& secondary_app_ids,
-                const std::string& required_platform_version);
+                const std::string& required_platform_version,
+                bool always_update);
   ~KioskModeInfo() override;
 
   // Gets the KioskModeInfo for |extension|, or NULL if none was
   // specified.
   static KioskModeInfo* Get(const Extension* extension);
 
   // Whether the extension or app is enabled for app kiosk mode.
   static bool IsKioskEnabled(const Extension* extension);
 
   // Whether the extension or app should only be available in kiosk mode.
   static bool IsKioskOnly(const Extension* extension);
 
   // Returns true if |extension| declares kiosk secondary apps.
   static bool HasSecondaryApps(const Extension* extension);
 
   // Whether the given |version_string| is a valid ChromeOS platform version.
   // The acceptable format is major[.minor[.micro]].
   static bool IsValidPlatformVersion(const std::string& version_string);
 
   KioskStatus kiosk_status;
 
   // The IDs of the kiosk secondary apps.
   const std::vector<std::string> secondary_app_ids;
 
   const std::string required_platform_version;
+  const bool always_update;
 };
 
 // Parses the "kiosk_enabled" and "kiosk_only" manifest keys.
 class KioskModeHandler : public ManifestHandler {
  public:
   KioskModeHandler();
   ~KioskModeHandler() override;
 
   bool Parse(Extension* extension, base::string16* error) override;
 
  private:
   const std::vector<std::string> Keys() const override;
 
   std::vector<std::string> supported_keys_;
 
   DISALLOW_COPY_AND_ASSIGN(KioskModeHandler);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_MANIFEST_HANDLERS_KIOSK_MODE_INFO_H_