Disable an extension when it is upgraded to a version that requires more

chrome/browser/extensions/extension_prefs.h

 // Copyright (c) 2009 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_EXTENSIONS_EXTENSION_PREFS_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 25 matching lines @@
   // Sets the order that toolstrip URLs appear in the shelf.
   void SetShelfToolstripOrder(const URLList& urls);
 
   // Called when an extension is installed, so that prefs get created.
   void OnExtensionInstalled(Extension* extension);
 
   // Called when an extension is uninstalled, so that prefs get cleaned up.
   void OnExtensionUninstalled(const Extension* extension,
                               bool external_uninstall);
 
+  // Returns the state (enabled/disabled) of the given extension.
+  Extension::State GetExtensionState(const std::string& extension_id);
+
+  // Called to change the extension's state when it is enabled/disabled.
+  void SetExtensionState(Extension* extension, Extension::State);
+
   // Returns base extensions install directory.
   const FilePath& install_directory() const { return install_directory_; }
 
   // Updates the prefs based on the blacklist.
   void UpdateBlacklist(const std::set<std::string>& blacklist_set);
 
   // Based on extension id, checks prefs to see if it is blacklisted.
   bool IsExtensionBlacklisted(const std::string& id);
 
  private:
@@ skipping 10 matching lines @@
   bool UpdateExtensionPref(const std::string& id,
                            const std::wstring& key,
                            Value* value);
 
   // Deletes the pref dictionary for extension |id|.
   void DeleteExtensionPrefs(const std::string& id);
 
   // Ensures and returns a mutable dictionary for extension |id|'s prefs.
   DictionaryValue* GetOrCreateExtensionPref(const std::string& id);
 
+  // Same as above, but returns NULL if it doesn't exist.
+  DictionaryValue* GetExtensionPref(const std::string& id);
+
   // Checks if kPrefBlacklist is set to true in the DictionaryValue.
   // Return false if the value is false or kPrefBlacklist does not exist.
   // This is used to decide if an extension is blacklisted.
   bool IsBlacklistBitSet(DictionaryValue* ext);
 
   // The pref service specific to this set of extension prefs.
   PrefService* prefs_;
 
   // Base extensions install directory.
   FilePath install_directory_;
@@ skipping 13 matching lines @@
 
   typedef Callback3<const std::string&,
                     const FilePath&,
                     Extension::Location>::Type Callback;
 
   // Runs |callback| for each installed extension with the path to the
   // version directory and the location. Blacklisted extensions won't trigger
   // the callback.
   void VisitInstalledExtensions(Callback *callback);
 
+  // Same as above, but only for the given extension.
+  void VisitInstalledExtension(const std::string& extension_id,
+                               Callback *callback);
+
  private:
   // A copy of the extensions pref dictionary so that this can be passed
   // around without a dependency on prefs.
   scoped_ptr<DictionaryValue> extension_data_;
 
   DISALLOW_COPY_AND_ASSIGN(InstalledExtensions);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_