Add tracing service and make the shell+sky_viewer+services talk to it

mojo/services/view_manager/view_manager_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 "mojo/services/view_manager/view_manager_app.h"
 
 #include "mojo/application/application_runner_chromium.h"
+#include "mojo/common/tracing_impl.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/services/view_manager/client_connection.h"
 #include "mojo/services/view_manager/connection_manager.h"
 #include "mojo/services/view_manager/display_manager.h"
 #include "mojo/services/view_manager/view_manager_service_impl.h"
 
 namespace mojo {
 namespace service {
 
 ViewManagerApp::ViewManagerApp() : wm_app_connection_(nullptr) {
 }
 ViewManagerApp::~ViewManagerApp() {}
 
+void ViewManagerApp::Initialize(ApplicationImpl* app) {
+  TracingImpl::Create(app);
+}
+
 bool ViewManagerApp::ConfigureIncomingConnection(
     ApplicationConnection* connection) {
   if (connection_manager_.get()) {
     VLOG(1) << "ViewManager allows only one window manager connection.";
     return false;
   }
   wm_app_connection_ = connection;
   // |connection| originates from the WindowManager. Let it connect directly
   // to the ViewManager and WindowManagerInternalClient.
   connection->AddService(
@@ skipping 64 matching lines @@
       connection_manager_.get(), request.Pass()));
   wm_internal_client_binding_->set_error_handler(this);
 }
 
 void ViewManagerApp::OnConnectionError() {
   ApplicationImpl::Terminate();
 }
 
 }  // namespace service
 }  // namespace mojo