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 10 matching lines @@
 namespace extensions {
 
 // For registering, loading, and unloading component extensions.
 class ComponentLoader : public content::NotificationObserver {
  public:
   ComponentLoader(ExtensionServiceInterface* extension_service,
                   PrefService* prefs,
                   PrefService* local_state);
   virtual ~ComponentLoader();
 
+  size_t registered_extensions_count() const {
+    return component_extensions_.size();
+  }
+
   // Loads any registered component extensions.
   void LoadAll();
 
   // 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();
@@ skipping 32 matching lines @@
                        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_