Auto-install/uninstall shared module dependencies for extensions.

chrome/browser/extensions/extension_service.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_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 
 #include <list>
 #include <map>
 #include <set>
@@ skipping 406 matching lines @@
 
   // Check if we have preferences for the component extension and, if not or if
   // the stored version differs, install the extension (without requirements
   // checking) before calling AddExtension.
   virtual void AddComponentExtension(const extensions::Extension* extension)
       OVERRIDE;
 
   // Launch an extension the next time it is loaded.
   void ScheduleLaunchOnLoad(const std::string& extension_id);
 
+  // Checks an extension's shared module imports to see if they are satisfied.
+  // If they are not, this function disables the extension, and optionally adds
+  // the dependencies to the pending install list.
+  bool CheckImports(const extensions::Extension* extension);
+
+  // Checks all extensions for missing imports and syncs them as needed.  Also
+  // sets the enable/disable state for extensions based on whether all of their
+  // imports are present.
+  void CheckImportsOnAllExtensions();
+
+  // Checks an extension's shared module imports to see if they would still be
+  // referenced by other extensions when a particular extension is uninstalled.
+  // Uninstalls shared modules that are no longer referenced.
+  void PruneSharedModulesOnUninstall(const extensions::Extension* extension);
+
   // Informs the service that an extension's files are in place for loading.
   //
   // Please make sure the Blacklist is checked some time before calling this
   // method.
   void OnExtensionInstalled(
       const extensions::Extension* extension,
       const syncer::StringOrdinal& page_ordinal,
       bool has_requirement_errors,
       bool wait_for_idle);
 
@@ skipping 559 matching lines @@
   ObserverList<extensions::UpdateObserver, true> update_observers_;
 
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsWithUnlimtedStorage);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsAndCheckStorageProtection);
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_