Adding the --load-component-extension flag.

chrome/browser/extensions/component_loader.h

 // Copyright (c) 2011 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_COMPONENT_LOADER_H_
 #define CHROME_BROWSER_EXTENSIONS_COMPONENT_LOADER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 23 matching lines @@
   // Registers and possibly loads a component extension. If ExtensionService
   // has been initialized, the extension is loaded; otherwise, the load is
   // deferred until LoadAll is called.
   const Extension* Add(std::string& manifest_contents,
                        const FilePath& root_directory);
 
   // Convenience method for registering a component extension by resource id.
   const Extension* Add(int manifest_resource_id,
                        const FilePath& root_directory);
 
+  // Loads a component extension from file system. Replaces previously added
+  // extension with the same ID.
+  const Extension* AddOrReplace(const FilePath& path);
+
   // Unloads a component extension and removes it from the list of component
   // extensions to be loaded.
   void Remove(const FilePath& root_directory);
+  void Remove(const std::string& id);
 
   // Adds the default component extensions.
   //
   // Component extension manifests must contain a 'key' property with a unique
   // public key, serialized in base64. You can create a suitable value with the
   // following commands on a unixy system:
   //
   //   ssh-keygen -t rsa -b 1024 -N '' -f /tmp/key.pem
   //   openssl rsa -pubout -outform DER < /tmp/key.pem 2>/dev/null | base64 -w 0
   void AddDefaultComponentExtensions();
 
   // content::NotificationObserver implementation
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   static void RegisterUserPrefs(PrefService* prefs);
 
   // Parse the given JSON manifest. Returns NULL if it cannot be parsed, or if
   // if the result is not a DictionaryValue.
   DictionaryValue* ParseManifest(const std::string& manifest_contents) const;
 
   // Clear the list of registered extensions.
   void ClearAllRegistered();
 
+  size_t GetRegisteredExtensionsCount() const {

[Aaron Boodman, 2011/12/06 19:43:35]

Sorry I didn't notice this earlier: This should be registered_extensions_count()
style because it's just a getter. And it should be moved up to the top of the
class, right below the constructors.

I'm pointing out a lot of style issues. You should probably review:

http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml

and:

http://www.chromium.org/developers/coding-style

[SeRya, 2011/12/06 22:19:37]

Done.

+    return component_extensions_.size();
+  }
+
  private:
   // Information about a registered component extension.
   struct ComponentExtensionInfo {
     ComponentExtensionInfo(const DictionaryValue* manifest,
                            const FilePath& root_directory)
         : manifest(manifest),
           root_directory(root_directory) {
     }
 
     // The parsed contents of the extensions's manifest file.
     const DictionaryValue* manifest;
 
     // Directory where the extension is stored.
     FilePath root_directory;
   };
 
   const Extension* Add(const DictionaryValue* parsed_manifest,
                        const FilePath& root_directory);
 
   // Loads a registered component extension.
   const Extension* Load(const ComponentExtensionInfo& info);
 
   void AddFileManagerExtension();
 
   // Add the enterprise webstore extension, or reload it if already loaded.
   void AddOrReloadEnterpriseWebStore();
 
+  // Returns true if an extension with the specified id has been added.
+  bool Exists(const std::string& id) const;
+
+  // Determine the extension id.
+  static std::string GenerateId(const base::DictionaryValue* manifest);
+
   PrefService* prefs_;
   PrefService* local_state_;
 
   ExtensionServiceInterface* extension_service_;
 
   // List of registered component extensions (see Extension::Location).
   typedef std::vector<ComponentExtensionInfo> RegisteredComponentExtensions;
   RegisteredComponentExtensions component_extensions_;
 
   PrefChangeRegistrar pref_change_registrar_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_COMPONENT_LOADER_H_