mandoline: write this after lunch.

components/mus/mus_app.cc

 // 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.
 
 #include "components/mus/mus_app.h"
 
 #include "base/stl_util.h"
 #include "components/mus/common/args.h"
 #include "components/mus/gles2/gpu_impl.h"
 #include "components/mus/surfaces/surfaces_scheduler.h"
@@ skipping 52 matching lines @@
 #if !defined(OS_ANDROID)
   hardware_rendering_available = gfx::GLSurface::InitializeOneOff();
   event_source_ = ui::PlatformEventSource::CreateDefault();
 #endif
 
   // TODO(rjkroege): It is possible that we might want to generalize the
   // GpuState object.
   if (!gpu_state_.get())
     gpu_state_ = new GpuState(hardware_rendering_available);
   connection_manager_.reset(new ws::ConnectionManager(this, surfaces_state_));
+
+  tracing_.Initialize(app);
 }
 
 bool MandolineUIServicesApp::ConfigureIncomingConnection(
     ApplicationConnection* connection) {
   connection->AddService<Gpu>(this);
   connection->AddService<mojom::WindowManager>(this);
   connection->AddService<WindowTreeHostFactory>(this);
   return true;
 }
 
@@ skipping 63 matching lines @@
       host_client.Pass(), connection_manager_.get(), app_impl_, gpu_state_,
       surfaces_state_, window_manager.Pass());
 
   // WindowTreeHostConnection manages its own lifetime.
   host_impl->Init(new ws::WindowTreeHostConnectionImpl(
       host.Pass(), make_scoped_ptr(host_impl), tree_client.Pass(),
       connection_manager_.get()));
 }
 
 }  // namespace mus