Refactor a bit.

service/memcache/interface.go

Index: service/memcache/interface.go
diff --git a/service/memcache/interface.go b/service/memcache/interface.go
new file mode 100644
index 0000000000000000000000000000000000000000..346155b42e8b2c5fff93b8027a88f811573592cd
--- /dev/null
+++ b/service/memcache/interface.go
@@ -0,0 +1,29 @@
+// 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 memcache
+
+// Interface is the full interface to the memcache service.
+type Interface interface {
+	NewItem(key string) Item
+
+	Add(item Item) error
+	Set(item Item) error
+	Get(key string) (Item, error)
+	Delete(key string) error
+	CompareAndSwap(item Item) error
+
+	AddMulti(items []Item) error
+	SetMulti(items []Item) error
+	GetMulti(keys []string) (map[string]Item, error)
+	DeleteMulti(keys []string) error
+	CompareAndSwapMulti(items []Item) error
+
+	Increment(key string, delta int64, initialValue uint64) (newValue uint64, err error)
+	IncrementExisting(key string, delta int64) (newValue uint64, err error)
+
+	Flush() error
+
+	Stats() (*Statistics, error)
+}