Add Info Testable interface, implement for memory.

impl/prod/info.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 prod
 
 import (
         "time"
 
         "github.com/luci/gae/service/info"
@@ skipping 93 matching lines @@
 func (g giImpl) ServiceAccount() (string, error) {
         return appengine.ServiceAccount(g.aeCtx)
 }
 func (g giImpl) SignBytes(bytes []byte) (keyName string, signature []byte, err error) {
         return appengine.SignBytes(g.aeCtx, bytes)
 }
 func (g giImpl) VersionID() string {
         return appengine.VersionID(g.aeCtx)
 }
 
+func (g giImpl) Testable() info.Testable {
+        return nil
+}
+
 type infoProbeCache struct {
         namespace string
         fqaid     string
 }
 
 func probe(aeCtx context.Context) *infoProbeCache {
         probeKey := datastore.NewKey(aeCtx, "Kind", "id", 0, nil)
         return &infoProbeCache{
                 namespace: probeKey.Namespace(),
                 fqaid:     probeKey.AppID(),
         }
 }
 
 func getProbeCache(c context.Context) *infoProbeCache {
         if pc, ok := c.Value(probeCacheKey).(*infoProbeCache); ok {
                 return pc
         }
         return nil
 }
 
 func withProbeCache(c context.Context, pc *infoProbeCache) context.Context {
         return context.WithValue(c, probeCacheKey, pc)
 }