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

services/service_manager/public/cpp/lib/service.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 "services/service_manager/public/cpp/service.h"
 
+#include "base/logging.h"
+
 namespace service_manager {
 
-Service::~Service() {}
+Service::Service() = default;
 
-void Service::OnStart(ServiceContext* context) {}
+Service::~Service() = default;
+
+void Service::OnStart() {}
+
+bool Service::OnConnect(const ServiceInfo& remote_info,
+                        InterfaceRegistry* registry) {
+  return false;
+}
 
 bool Service::OnStop() { return true; }
 
+ServiceContext* Service::context() const {
+  DCHECK(service_context_)
+      << "Service::context() may only be called during or after OnStart().";
+  return service_context_;
+}
+
+ForwardingService::ForwardingService(Service* target) : target_(target) {}
+
+ForwardingService::~ForwardingService() {}
+
+void ForwardingService::OnStart() {
+  target_->set_context(context());
+  target_->OnStart();
+}
+
+bool ForwardingService::OnConnect(const ServiceInfo& remote_info,
+                                  InterfaceRegistry* registry) {
+  return target_->OnConnect(remote_info, registry);
+}
+
+bool ForwardingService::OnStop() { return target_->OnStop(); }
+
 }  // namespace service_manager