Auto-install/uninstall shared module dependencies for extensions.

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index a81a5f95b773887f337f644db06d2a6a78d3c3ec..73265048a855a0e2a96e62529fb896e6612e6715 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -424,6 +424,21 @@ class ExtensionService
   // 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