Make tracing work in service manager

services/service_manager/standalone/context.h

 // Copyright 2013 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 SERVICES_SERVICE_MANAGER_STANDALONE_CONTEXT_H_
 #define SERVICES_SERVICE_MANAGER_STANDALONE_CONTEXT_H_
 
 #include <memory>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread.h"
 #include "base/time/time.h"
 #include "mojo/edk/embedder/process_delegate.h"
 #include "services/service_manager/service_manager.h"
 #include "services/service_manager/standalone/tracer.h"
+#include "services/tracing/public/cpp/provider.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace catalog {
 class Catalog;
 class Store;
 }
 
@@ skipping 37 matching lines @@
   // Runs the app specified by |name|.
   void Run(const std::string& name);
 
   scoped_refptr<base::SingleThreadTaskRunner> service_manager_runner_;
   std::unique_ptr<base::Thread> io_thread_;
   scoped_refptr<base::SequencedWorkerPool> blocking_pool_;
 
   // Ensure this is destructed before task_runners_ since it owns a message pipe
   // that needs the IO thread to destruct cleanly.
   Tracer tracer_;
+  tracing::Provider provider_;
   std::unique_ptr<catalog::Catalog> catalog_;
   std::unique_ptr<ServiceManager> service_manager_;
   base::Time main_entry_time_;
   bool init_edk_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(Context);
 };
 
 }  // namespace service_manager
 
 #endif  // SERVICES_SERVICE_MANAGER_STANDALONE_CONTEXT_H_