Interface update, per-method Contexts.

filter/count/rds.go

Index: filter/count/rds.go
diff --git a/filter/count/rds.go b/filter/count/rds.go
index 418878fdf3927eb2705f03d0ed34bd10ed66e2ce..cc55ad3ceea17fbb3b74a3822a2bca407c7e391d 100644
--- a/filter/count/rds.go
+++ b/filter/count/rds.go
@@ -64,8 +64,15 @@ func (r *dsCounter) PutMulti(keys []*ds.Key, vals []ds.PropertyMap, cb ds.NewKey
 	return r.c.PutMulti.upFilterStop(r.ds.PutMulti(keys, vals, cb))
 }
 
-func (r *dsCounter) Testable() ds.Testable {
-	return r.ds.Testable()
+func (r *dsCounter) CurrentTransaction() ds.Transaction {
+	return r.ds.CurrentTransaction()
+}
+func (r *dsCounter) WithTransaction(t ds.Transaction) context.Context {
+	return r.ds.WithTransaction(t)
+}
+
+func (r *dsCounter) GetTestable() ds.Testable {
+	return r.ds.GetTestable()
 }
 
 // FilterRDS installs a counter datastore filter in the context.