Create ServiceWorkerProviderHost before starting worker

content/browser/service_worker/service_worker_version.cc

 // 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.
 
 #include "content/browser/service_worker/service_worker_version.h"
 
 #include <stddef.h>
 
 #include <limits>
 #include <map>
@@ skipping 182 matching lines @@
       // renderer shutdown like crash.
       embedded_worker->Detach();
       break;
     case EmbeddedWorkerStatus::STOPPING:
     case EmbeddedWorkerStatus::STOPPED:
       // Do nothing
       break;
   }
 }
 
+mojom::ServiceWorkerProviderInfoForStartWorkerPtr
+CompleteProviderHostPreparation(
+    ServiceWorkerVersion* version,
+    std::unique_ptr<ServiceWorkerProviderHost> provider_host,
+    base::WeakPtr<ServiceWorkerContextCore> context,
+    int process_id) {
+  auto info =
+      provider_host->CompleteStartWorkerPreparation(process_id, version);
+  context->AddProviderHost(std::move(provider_host));

[falken, 2017/06/19 07:50:40]

Could context be null?

If not, we could DCHECK(context) and add a comment why it's never null.

[shimazu, 2017/06/19 10:41:25]

Done.

+  return info;
+}
+
 }  // namespace
 
 const int ServiceWorkerVersion::kTimeoutTimerDelaySeconds = 30;
 const int ServiceWorkerVersion::kStartInstalledWorkerTimeoutSeconds = 60;
 const int ServiceWorkerVersion::kStartNewWorkerTimeoutMinutes = 5;
 const int ServiceWorkerVersion::kRequestTimeoutMinutes = 5;
 const int ServiceWorkerVersion::kStopWorkerTimeoutSeconds = 5;
 
 void ServiceWorkerVersion::RestartTick(base::TimeTicks* time) const {
   *time = tick_clock_->NowTicks();
@@ skipping 627 matching lines @@
     ServiceWorkerMetrics::EventType event_type)
     : error_callback(callback),
       start_time(time),
       start_time_ticks(time_ticks),
       event_type(event_type) {}
 
 ServiceWorkerVersion::PendingRequest::~PendingRequest() {}
 
 void ServiceWorkerVersion::OnThreadStarted() {
   DCHECK_EQ(EmbeddedWorkerStatus::STARTING, running_status());
+  DCHECK(provider_host_);
+  provider_host_->SetReadyToSendMessagesToWorker(
+      embedded_worker()->thread_id());
   // Activate ping/pong now that JavaScript execution will start.
   ping_controller_->Activate();
 }
 
 void ServiceWorkerVersion::OnStarting() {
   for (auto& observer : listeners_)
     observer.OnRunningStateChanged(this);
 }
 
 void ServiceWorkerVersion::OnStarted() {
@@ skipping 599 matching lines @@
   DCHECK_EQ(EmbeddedWorkerStatus::STOPPED, running_status());
 
   if (!ServiceWorkerMetrics::ShouldExcludeSiteFromHistogram(site_for_uma_)) {
     DCHECK(!event_recorder_);
     event_recorder_ =
         base::MakeUnique<ServiceWorkerMetrics::ScopedEventRecorder>();
   }
 
   StartTimeoutTimer();
 
+  std::unique_ptr<ServiceWorkerProviderHost> pending_provider_host =
+      ServiceWorkerProviderHost::PreCreateForController(context());
+  provider_host_ = pending_provider_host->AsWeakPtr();
+
   auto params = base::MakeUnique<EmbeddedWorkerStartParams>();
   params->service_worker_version_id = version_id_;
   params->scope = scope_;
   params->script_url = script_url_;
   params->is_installed = IsInstalled(status_);
   params->pause_after_download = pause_after_download_;
 
   embedded_worker_->Start(
-      std::move(params), mojo::MakeRequest(&event_dispatcher_),
+      std::move(params),
+      // Unretained is used here because the callback will be owned by
+      // |embedded_worker_| whose owner is |this|.
+      base::BindOnce(&CompleteProviderHostPreparation, base::Unretained(this),
+                     base::Passed(&pending_provider_host), context()),
+      mojo::MakeRequest(&event_dispatcher_),
       base::Bind(&ServiceWorkerVersion::OnStartSentAndScriptEvaluated,
                  weak_factory_.GetWeakPtr()));
   event_dispatcher_.set_connection_error_handler(base::Bind(
       &OnEventDispatcherConnectionError, embedded_worker_->AsWeakPtr()));
 }
 
 void ServiceWorkerVersion::StartTimeoutTimer() {
   DCHECK(!timeout_timer_.IsRunning());
 
   if (embedded_worker_->devtools_attached()) {
@@ skipping 371 matching lines @@
 
 void ServiceWorkerVersion::CleanUpExternalRequest(
     const std::string& request_uuid,
     ServiceWorkerStatusCode status) {
   if (status == SERVICE_WORKER_OK)
     return;
   external_request_uuid_to_request_id_.erase(request_uuid);
 }
 
 }  // namespace content