Add User service.

service/user/interface.go

+// Copyright 2015 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 user
+
+// Interface provides access to the "appengine/users" API methods.
+type Interface interface {
+        Current() *User
+        CurrentOAuth() (*User, error)
+
+        IsAdmin() bool
+
+        LoginURL(dest string) (string, error)
+        LoginURLFederated(dest, identity string) (string, error)
+        LogoutURL(dest string) (string, error)
+
+        OAuthConsumerKey() (string, error)
+}