Add "kiosk_only" manifest attribute for platform apps.

chrome/common/extensions/manifest_handlers/kiosk_enabled_info.h

-// Copyright (c) 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 CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_KIOSK_ENABLED_INFO_H_
-#define CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_KIOSK_ENABLED_INFO_H_
-
-#include <string>
-#include <vector>
-
-#include "chrome/common/extensions/extension.h"
-#include "chrome/common/extensions/manifest_handler.h"
-#include "extensions/common/manifest.h"
-
-namespace extensions {
-
-struct KioskEnabledInfo : public Extension::ManifestData {
-  explicit KioskEnabledInfo(bool is_kiosk_enabled);
-  virtual ~KioskEnabledInfo();
-
-  bool kiosk_enabled;
-
-  // Whether the extension or app should be enabled in app kiosk mode.
-  static bool IsKioskEnabled(const Extension* extension);
-};
-
-// Parses the "kiosk_enabled" manifest key.
-class KioskEnabledHandler : public ManifestHandler {
- public:
-  KioskEnabledHandler();
-  virtual ~KioskEnabledHandler();
-
-  virtual bool Parse(Extension* extension, string16* error) OVERRIDE;
- private:
-  virtual const std::vector<std::string> Keys() const OVERRIDE;
-
-  DISALLOW_COPY_AND_ASSIGN(KioskEnabledHandler);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_KIOSK_ENABLED_INFO_H_