mandoline: write this after lunch.

components/mus/mus_app.h

 // 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.
 
 #ifndef COMPONENTS_MUS_MUS_APP_H_
 #define COMPONENTS_MUS_MUS_APP_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 73 matching lines @@
                             mojom::WindowTreeClientPtr tree_client,
                             mojom::WindowManagerPtr window_manager) override;
 
   mojo::WeakBindingSet<mojom::WindowTreeHostFactory> factory_bindings_;
   scoped_ptr<ws::ForwardingWindowManager> window_manager_impl_;
   mojo::WeakBindingSet<mojom::WindowManager> window_manager_bindings_;
   mojo::ApplicationImpl* app_impl_;
   scoped_ptr<ws::ConnectionManager> connection_manager_;
   scoped_refptr<GpuState> gpu_state_;
   scoped_ptr<ui::PlatformEventSource> event_source_;
+  mojo::TracingImpl tracing_;
   using WindowManagerRequests =
       std::vector<scoped_ptr<mojo::InterfaceRequest<mojom::WindowManager>>>;
   WindowManagerRequests pending_window_manager_requests_;
 
   // Surfaces
   scoped_refptr<SurfacesState> surfaces_state_;
 
   DISALLOW_COPY_AND_ASSIGN(MandolineUIServicesApp);
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_MUS_APP_H_