Interface update, per-method Contexts.

service/memcache/types.go

Index: service/memcache/types.go
diff --git a/service/memcache/types.go b/service/memcache/types.go
index 8b4472e4e81b9f3bbbade34647fa607ac103d7e0..5d3414ef75f5f6aa6743169490956fd86c6b3d70 100644
--- a/service/memcache/types.go
+++ b/service/memcache/types.go
@@ -26,7 +26,7 @@ type Statistics struct {
 // return the original Item (e.g. they mutate the original), due to
 // implementation constraints. They return the original item to allow easy
 // chaining, e.g.:
-//   itm := memcache.Get(c).NewItem("foo").SetValue([]byte("stuff"))
+//   itm := memcache.NewItem(c, "foo").SetValue([]byte("stuff"))
 type Item interface {
 	Key() string
 	Value() []byte