Install platform apps into a separate data directory

chrome/common/extensions/extension.h

 // Copyright (c) 2012 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_EXTENSION_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 580 matching lines @@
   bool is_theme() const { return manifest()->IsTheme(); }
   base::DictionaryValue* GetThemeImages() const { return theme_images_.get(); }
   base::DictionaryValue* GetThemeColors() const {return theme_colors_.get(); }
   base::DictionaryValue* GetThemeTints() const { return theme_tints_.get(); }
   base::DictionaryValue* GetThemeDisplayProperties() const {
     return theme_display_properties_.get();
   }
 
   GURL GetBackgroundURL() const;
 
+  // Returns true if this extension should be run in its own user data
+  // directory.

[jeremy, 2012/02/12 09:40:28]

Can you expand the comment as to when this is the case.

+  bool RequiresSeparateUserDataDirectory() const;
+
  private:
   friend class base::RefCountedThreadSafe<Extension>;
 
   // We keep a cache of images loaded from extension resources based on their
   // path and a string representation of a size that may have been used to
   // scale it (or the empty string if the image is at its original size).
   typedef std::pair<FilePath, std::string> ImageCacheKey;
   typedef std::map<ImageCacheKey, SkBitmap> ImageCache;
 
   class RuntimeData {
@@ skipping 346 matching lines @@
   // only contain the removed permissions.
   const ExtensionPermissionSet* permissions;
 
   UpdatedExtensionPermissionsInfo(
       const Extension* extension,
       const ExtensionPermissionSet* permissions,
       Reason reason);
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_H_