Mojo: request/response bindings

mojo/examples/view_manager/view_manager.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 {
 
 [Peer=ViewClient]
 interface View {
   SetId(int32 id);
-  GetId();
+  GetId() => (int32 id);
 };
 
 [Peer=View]
 interface ViewClient {
-  OnGotId(int32 id);
 };
 
 [Peer=ViewManagerClient]
 interface ViewManager {
-  CreateView();
+  CreateView() => (View view);
 };
 
 [Peer=ViewManager]
 interface ViewManagerClient {
-  OnViewCreated(View view);
 };
 
 }