Add API to allow you to get the non-transactional datastore or taskqueue.

impl/prod/taskqueue.go

Index: impl/prod/taskqueue.go
diff --git a/impl/prod/taskqueue.go b/impl/prod/taskqueue.go
index 08c3441ccfca6b4e6f8b0c46fabd75fc166e7b40..77cd201dd613820a2a7217b726c9117d505509af 100644
--- a/impl/prod/taskqueue.go
+++ b/impl/prod/taskqueue.go
@@ -17,8 +17,11 @@ import (
 // useTQ adds a gae.TaskQueue implementation to context, accessible
 // by gae.GetTQ(c)
 func useTQ(c context.Context) context.Context {
-	return tq.SetRawFactory(c, func(ci context.Context) tq.RawInterface {
-		return tqImpl{AEContext(ci)}
+	return tq.SetRawFactory(c, func(ci context.Context, wantTxn bool) tq.RawInterface {
+		if wantTxn {
+			return tqImpl{AEContext(ci)}
+		}
+		return tqImpl{AEContextNoTxn(ci)}
 	})
 }