Refactor a bit.

impl/prod/context.go

Index: impl/prod/context.go
diff --git a/prod/context.go b/impl/prod/context.go
similarity index 53%
rename from prod/context.go
rename to impl/prod/context.go
index 337fce0759f0e41474c56166221a0bbead2aa91c..401e10ef5a2f5a1583a8e4841bb5bc0bc8a287c4 100644
--- a/prod/context.go
+++ b/impl/prod/context.go
@@ -8,14 +8,15 @@ import (
 	"golang.org/x/net/context"
 )
 
-// Use adds implementations for the following gae interfaces to the
-// context:
-//   * gae.RawDatastore
-//   * gae.TaskQueue
-//   * gae.Memcache
-//   * gae.GlobalInfo
+// Use adds production implementations for all the gae services to the context.
 //
-// These can be retrieved with the gae.Get functions.
+// The services added are:
+//   - github.com/luci/gae/service/rawdatastore
+//   - github.com/luci/gae/service/taskqueue
+//   - github.com/luci/gae/service/memcache
+//   - github.com/luci/gae/service/info
+//
+// These can be retrieved with the <service>.Get functions.
 //
 // The implementations are all backed by the real appengine SDK functionality,
 func Use(c context.Context) context.Context {