Invoke callback from WebstoreInstaller when installation is fully complete

extensions/browser/extension_registry.h

Index: extensions/browser/extension_registry.h
diff --git a/extensions/browser/extension_registry.h b/extensions/browser/extension_registry.h
index 646863c224623475d3b242333fe033699ad582bd..3d1076315375a5c936e06d9724daac1e4f2de88d 100644
--- a/extensions/browser/extension_registry.h
+++ b/extensions/browser/extension_registry.h
@@ -86,6 +86,10 @@ class ExtensionRegistry : public KeyedService {
                                 bool from_ephemeral,
                                 const std::string& old_name);
 
+  // Invokes the observer method OnExtensionInstalled(). The extension must be
+  // contained in one of the registry's extension sets.
+  void TriggerOnInstalled(const Extension* extension);
+
   // Invokes the observer method OnExtensionUninstalled(). The extension must
   // not be any installed extension with |extension|'s ID.
   void TriggerOnUninstalled(const Extension* extension);