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

mash/webtest/webtest.cc

 // 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.
 
 #include "mash/webtest/webtest.h"
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string16.h"
@@ skipping 140 matching lines @@
 }
 
 void Webtest::RemoveWindow(views::Widget* window) {
   auto it = std::find(windows_.begin(), windows_.end(), window);
   DCHECK(it != windows_.end());
   windows_.erase(it);
   if (windows_.empty())
     base::MessageLoop::current()->QuitWhenIdle();
 }
 
-void Webtest::OnStart() {
-  tracing_.Initialize(context()->connector(), context()->identity().name());
+void Webtest::OnStart(service_manager::ServiceContext* context) {
+  context_ = context;
+
+  tracing_.Initialize(context->connector(), context->identity().name());
   aura_init_ = base::MakeUnique<views::AuraInit>(
-      context()->connector(), context()->identity(), "views_mus_resources.pak");
+      context->connector(), context->identity(), "views_mus_resources.pak");
   window_manager_connection_ = views::WindowManagerConnection::Create(
-      context()->connector(), context()->identity());
+      context->connector(), context->identity());
 }
 
 bool Webtest::OnConnect(const service_manager::ServiceInfo& remote_info,
                         service_manager::InterfaceRegistry* registry) {
   registry->AddInterface<mojom::Launchable>(this);
   return true;
 }
 
 void Webtest::Launch(uint32_t what, mojom::LaunchMode how) {
   bool reuse = how == mojom::LaunchMode::REUSE ||
                how == mojom::LaunchMode::DEFAULT;
   if (reuse && !windows_.empty()) {
     windows_.back()->Activate();
     return;
   }
 
   navigation::mojom::ViewFactoryPtr view_factory;
-  context()->connector()->ConnectToInterface("exe:navigation", &view_factory);
+  context_->connector()->ConnectToInterface("exe:navigation", &view_factory);
   navigation::mojom::ViewPtr view;
   navigation::mojom::ViewClientPtr view_client;
   navigation::mojom::ViewClientRequest view_client_request =
       GetProxy(&view_client);
   view_factory->CreateView(std::move(view_client), GetProxy(&view));
   UI* ui = new UI(this, std::move(view), std::move(view_client_request));
   views::Widget* window = views::Widget::CreateWindowWithContextAndBounds(
       ui, nullptr, gfx::Rect(50, 10, 600, 600));
   ui->NavigateTo(GURL("http://www.theverge.com/"));
   window->Show();
   AddWindow(window);
 }
 
 void Webtest::Create(const service_manager::Identity& remote_identity,
                      mojom::LaunchableRequest request) {
   bindings_.AddBinding(this, std::move(request));
 }
 
 }  // namespace webtest
 }  // namespace mash