Revert of Service Manager: Remove ServiceContext* arg from Service::OnStart()

mash/init/init.h

 // Copyright 2016 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 MASH_INIT_INIT_H_
 #define MASH_INIT_INIT_H_
 
 #include <map>
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "mash/init/public/interfaces/init.mojom.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/service_manager/public/cpp/interface_factory.h"
 #include "services/service_manager/public/cpp/service.h"
 
 namespace service_manager {
 class Connection;
+class ServiceContext;
 }
 
 namespace mash {
 namespace init {
 
 class Init : public service_manager::Service,
              public service_manager::InterfaceFactory<mojom::Init>,
              public mojom::Init {
  public:
   Init();
   ~Init() override;
 
  private:
   // service_manager::Service:
-  void OnStart() override;
+  void OnStart(service_manager::ServiceContext* context) override;
   bool OnConnect(const service_manager::ServiceInfo& remote_info,
                  service_manager::InterfaceRegistry* registry) override;
 
   // service_manager::InterfaceFactory<mojom::Login>:
   void Create(const service_manager::Identity& remote_identity,
               mojom::InitRequest request) override;
 
   // mojom::Init:
   void StartService(const std::string& name,
                     const std::string& user_id) override;
   void StopServicesForUser(const std::string& user_id) override;
 
   void UserServiceQuit(const std::string& user_id);
 
   void StartTracing();
   void StartLogin();
 
+  service_manager::ServiceContext* context_ = nullptr;
+
   std::unique_ptr<service_manager::Connection> login_connection_;
   mojo::BindingSet<mojom::Init> init_bindings_;
   std::map<std::string, std::unique_ptr<service_manager::Connection>>
       user_services_;
 
   DISALLOW_COPY_AND_ASSIGN(Init);
 };
 
 }  // namespace init
 }  // namespace mash
 
 #endif  // MASH_INIT_INIT_H_