// Adds an extension manifest to a builder.
ExtensionBuilder& BuildExtension(ExtensionBuilder& builder);
-// Return a very simple extension with a given |id|.
-scoped_refptr<Extension> CreateExtensionWithID(const std::string& id);
+// Adds an app manifest to a builder.
+ExtensionBuilder& BuildApp(ExtensionBuilder& builder);
+
+// Creates an extension instance that can be attached to an ExtensionFunction
+// before running it.
+scoped_refptr<Extension> CreateEmptyExtension();
+
+// Create an extension with a variable |id|, for tests that require multiple
+// extensions side-by-side having distinct IDs.
+scoped_refptr<Extension> CreateEmptyExtension(const std::string& id);
} // namespace test_util
} // namespace extensions