Re-add metadata passthrough on Get operations

impl/memory/raw_datastore.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 memory
 
 import (
         "errors"
 
         "golang.org/x/net/context"
@@ skipping 34 matching lines @@
 
 func (d *dsImpl) NewKey(kind, stringID string, intID int64, parent ds.Key) ds.Key {
         return ds.NewKey(globalAppID, d.ns, kind, stringID, intID, parent)
 }
 
 func (d *dsImpl) PutMulti(keys []ds.Key, vals []ds.PropertyMap, cb ds.PutMultiCB) error {
         d.data.putMulti(keys, vals, cb)
         return nil
 }
 
-func (d *dsImpl) GetMulti(keys []ds.Key, cb ds.GetMultiCB) error {
+func (d *dsImpl) GetMulti(keys []ds.Key, _meta ds.MultiMetaGetter, cb ds.GetMultiCB) error {
         d.data.getMulti(keys, cb)
         return nil
 }
 
 func (d *dsImpl) DeleteMulti(keys []ds.Key, cb ds.DeleteMultiCB) error {
         d.data.delMulti(keys, cb)
         return nil
 }
 
 func (d *dsImpl) NewQuery(kind string) ds.Query {
@@ skipping 26 matching lines @@
         return ds.NewKey(globalAppID, d.ns, kind, stringID, intID, parent)
 }
 
 func (d *txnDsImpl) PutMulti(keys []ds.Key, vals []ds.PropertyMap, cb ds.PutMultiCB) error {
         return d.data.run(func() error {
                 d.data.putMulti(keys, vals, cb)
                 return nil
         })
 }
 
-func (d *txnDsImpl) GetMulti(keys []ds.Key, cb ds.GetMultiCB) error {
+func (d *txnDsImpl) GetMulti(keys []ds.Key, _meta ds.MultiMetaGetter, cb ds.GetMultiCB) error {
         return d.data.run(func() error {
                 return d.data.getMulti(keys, cb)
         })
 }
 
 func (d *txnDsImpl) DeleteMulti(keys []ds.Key, cb ds.DeleteMultiCB) error {
         return d.data.run(func() error {
                 return d.data.delMulti(keys, cb)
         })
 }
 
 func (d *txnDsImpl) Run(q ds.Query, cb ds.RawRunCB) error {
         rq := q.(*queryImpl)
         if rq.ancestor == nil {
                 return errors.New("memory: queries in transactions only support ancestor queries")
         }
         panic("NOT IMPLEMENTED")
 }
 
 func (*txnDsImpl) RunInTransaction(func(c context.Context) error, *ds.TransactionOptions) error {
         return errors.New("datastore: nested transactions are not supported")
 }
 
 func (d *txnDsImpl) NewQuery(kind string) ds.Query {
         return &queryImpl{ns: d.ns, kind: kind}
 }