Add wrappers for the module module

service/module/interface.go

Index: service/module/interface.go
diff --git a/service/module/interface.go b/service/module/interface.go
new file mode 100644
index 0000000000000000000000000000000000000000..f8ab8a35087821a234eda1b3eca648719de633bd
--- /dev/null
+++ b/service/module/interface.go
@@ -0,0 +1,17 @@
+// Copyright 2016 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.
+
+package module
+
+// Interface is the interface for all of the package methods which normally
+// would be in the 'module' package.
+type Interface interface {
+	List() ([]string, error)
+	NumInstances(module, version string) (int, error)
+	SetNumInstances(module, version string, instances int) error
+	Versions(module string) ([]string, error)
+	DefaultVersion(module string) (string, error)
+	Start(module, version string) error
+	Stop(module, version string) error
+}