Make impl/memory have an AppID.

impl/memory/info.go

Index: impl/memory/info.go
diff --git a/impl/memory/info.go b/impl/memory/info.go
index a52d02ab5d7c82ecc33949f173150deb1b2c6427..4f8fb8b43aef0a1fba518ad290ebbeedbddc4bac 100644
--- a/impl/memory/info.go
+++ b/impl/memory/info.go
@@ -26,19 +26,14 @@ func curGID(c context.Context) *globalInfoData {
 
 // useGI adds a gae.GlobalInfo context, accessible
 // by gae.GetGI(c)
-func useGI(c context.Context) context.Context {
+func useGI(c context.Context, appID string) context.Context {
 	return info.SetFactory(c, func(ic context.Context) info.Interface {
 		return &giImpl{dummy.Info(), curGID(ic), ic}
 	})
 }
 
-// globalAppID is the 'AppID' of everythin returned from this memory
-// implementation (DSKeys, GlobalInfo, etc.). There's no way to modify this
-// value through the API, and there are a couple bits of code where it's hard to
-// route this value through to without making the internal APIs really complex.
-const globalAppID = "dev~app"
-
 type globalInfoData struct {
+	appid     string
 	namespace string
 }
 
@@ -58,15 +53,15 @@ func (gi *giImpl) Namespace(ns string) (ret context.Context, err error) {
 	if !validNamespace.MatchString(ns) {
 		return nil, fmt.Errorf("appengine: namespace %q does not match /%s/", ns, validNamespace)
 	}
-	return context.WithValue(gi.c, giContextKey, &globalInfoData{ns}), nil
+	return context.WithValue(gi.c, giContextKey, &globalInfoData{gi.appid, ns}), nil
 }
 
 func (gi *giImpl) AppID() string {
-	return globalAppID
+	return gi.appid
 }
 
 func (gi *giImpl) FullyQualifiedAppID() string {
-	return globalAppID
+	return gi.appid
 }
 
 func (gi *giImpl) IsDevAppServer() bool {