Use local ids for Surfaces APIs that can only apply to local surfaces

mojo/services/surfaces/public/interfaces/surface_id.mojom

 // Copyright 2014 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.
 
 module mojo;
 
 // A surface ID is composed of two parts, a local part and a namespace. The
 // local part is allocated by the client using any scheme that avoids
 // duplicates. The namespace is allocated by the service and will be different
 // for each client (aka each connection to mojo.Surface).
+//
+// The special id_namespace value 0 is equivalent to the namespace of the
+// client. This can be used to created, destroy and submit frames to

[sky, 2015/01/13 18:14:27]

created->create

[jamesr, 2015/01/14 01:50:29]

Done.

+// surfaces before learning the namespace and to reference other surfaces
+// owned by the same client. The actual id namespace must be used to pass
+// surface ids to other clients for them to reference.
 struct SurfaceId {
   uint32 local;
   uint32 id_namespace;
 };