Surfaces should acknowledge frame submissions

mojo/services/public/interfaces/surfaces/surfaces.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;
 
 import "mojo/services/public/interfaces/geometry/geometry.mojom";
 import "mojo/services/public/interfaces/gpu/command_buffer.mojom";
 import "mojo/services/public/interfaces/surfaces/quads.mojom";
 import "mojo/services/public/interfaces/surfaces/surface_id.mojom";
@@ skipping 44 matching lines @@
   ReturnResources(array<ReturnedResource> resources);
 };
 
 [Client=SurfaceClient]
 interface Surface {
   // The id is created by the client and must be unique and contain the
   // connection's namespace in the upper 32 bits.
   CreateSurface(SurfaceId id, Size size);
 
   // The client can only submit frames to surfaces created with this connection.
-  SubmitFrame(SurfaceId id, Frame frame);
+  SubmitFrame(SurfaceId id, Frame frame) => ();

[jamesr, 2014/11/24 20:42:01]

can you document the callback a bit?

   DestroySurface(SurfaceId id);
 
   CreateGLES2BoundSurface(CommandBuffer gles2_client,
                           SurfaceId id,
                           Size size);
 };