Add DefaultVersionHostname to impl/memory/info.

impl/memory/info.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package memory
 
 import (
         "fmt"
         "regexp"
 
@@ skipping 88 matching lines @@
 }
 
 func (gi *giImpl) AppID() string {
         return gi.appID
 }
 
 func (gi *giImpl) FullyQualifiedAppID() string {
         return gi.fqAppID
 }
 
+func (gi *giImpl) DefaultVersionHostname() string {
+        return fmt.Sprintf("%s.example.com", gi.appID)
+}
+
 func (gi *giImpl) IsDevAppServer() bool {
         return true
 }
 
 func (gi *giImpl) VersionID() string {
         return curGID(gi.c).versionID
 }
 
 func (gi *giImpl) RequestID() string {
         return curGID(gi.c).requestID
 }
 
 func (gi *giImpl) Testable() info.Testable {
         return gi
 }
 
 func (gi *giImpl) SetVersionID(v string) context.Context {
         return useGID(gi.c, func(mod *globalInfoData) {
                 mod.versionID = v
         })
 }
 
 func (gi *giImpl) SetRequestID(v string) context.Context {
         return useGID(gi.c, func(mod *globalInfoData) {
                 mod.requestID = v
         })
 }