Implement the infrastructure of creating WorkerFetchContext in worker global scope.

content/renderer/service_worker/service_worker_fetch_context_impl.cc

+// Copyright 2017 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/renderer/service_worker/service_worker_fetch_context_impl.h"
+
+#include "content/child/request_extra_data.h"
+#include "content/child/resource_dispatcher.h"
+#include "content/child/web_url_loader_impl.h"
+
+namespace content {
+
+ServiceWorkerFetchContextImpl::ServiceWorkerFetchContextImpl(
+    mojom::WorkerURLLoaderFactoryProviderPtrInfo provider_info,
+    int service_worker_provider_id)
+    : provider_info_(std::move(provider_info)),
+      service_worker_provider_id_(service_worker_provider_id) {}
+
+ServiceWorkerFetchContextImpl::~ServiceWorkerFetchContextImpl() {}
+
+void ServiceWorkerFetchContextImpl::InitializeOnWorkerThread(
+    base::SingleThreadTaskRunner* loading_task_runner) {
+  DCHECK(provider_info_.is_valid());
+  resource_dispatcher_ =
+      base::MakeUnique<ResourceDispatcher>(nullptr, loading_task_runner);
+  provider_.Bind(std::move(provider_info_));
+  provider_->GetURLLoaderFactory(mojo::MakeRequest(&url_loader_factory_));
+}
+
+std::unique_ptr<blink::WebURLLoader>
+ServiceWorkerFetchContextImpl::CreateURLLoader() {
+  return base::MakeUnique<content::WebURLLoaderImpl>(resource_dispatcher_.get(),
+                                                     url_loader_factory_.get());
+}
+
+void ServiceWorkerFetchContextImpl::WillSendRequest(
+    blink::WebURLRequest& request) {
+  RequestExtraData* extra_data = new RequestExtraData();
+  extra_data->set_service_worker_provider_id(service_worker_provider_id_);
+  extra_data->set_originated_from_service_worker(true);
+  extra_data->set_initiated_in_secure_context(true);
+  request.SetExtraData(extra_data);
+}
+
+bool ServiceWorkerFetchContextImpl::IsControlledByServiceWorker() const {
+  return false;
+}
+
+}  // namespace content