[proof-of-concept] SW thread independent of the main thread

content/browser/service_worker/service_worker_service_impl.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 "content/browser/service_worker/service_worker_service_impl.h"
+
+#include "content/browser/service_worker/service_worker_context_core.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace content {
+
+ServiceWorkerServiceImpl::ServiceWorkerServiceImpl(
+    base::WeakPtr<ServiceWorkerContextCore> context,
+    blink::mojom::ServiceWorkerServiceRequest request)
+    : context_(context), binding_(this, std::move(request)) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  binding_.set_connection_error_handler(
+      base::Bind(&ServiceWorkerServiceImpl::OnConnectionError,
+                 base::Unretained(this) /* the channel is owned by this */));
+}
+
+ServiceWorkerServiceImpl::~ServiceWorkerServiceImpl() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+}
+
+void ServiceWorkerServiceImpl::ReplaceContext(
+    base::WeakPtr<ServiceWorkerContextCore> context) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  context_ = context;
+}
+
+void ServiceWorkerServiceImpl::WorkerStarted(int32_t embedded_worker_id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  LOG(ERROR) << "ServiceWorkerServiceImpl::WorkerStarted "
+             << embedded_worker_id;
+}
+
+void ServiceWorkerServiceImpl::OnConnectionError() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (!context_)
+    return;
+  context_->ServiceHadConnectionError(this);
+  // |this| is now deleted.
+}
+
+}  // namespace content