Implement the infrastructure of creating WorkerFetchContext in worker global scope.

third_party/WebKit/Source/core/loader/WorkerFetchContext.cpp

+// 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 "core/loader/WorkerFetchContext.h"
+
+#include "core/workers/WorkerClients.h"
+#include "core/workers/WorkerGlobalScope.h"
+#include "platform/Supplementable.h"
+#include "platform/WebTaskRunner.h"
+#include "platform/exported/WrappedResourceRequest.h"
+#include "public/platform/Platform.h"
+#include "public/platform/WebScheduler.h"
+#include "public/platform/WebThread.h"
+#include "public/platform/WebWorkerFetchContext.h"
+
+namespace blink {
+
+namespace {
+
+class WorkerFetchContextInfo final

[nhiroki, 2017/04/18 07:56:41]

Can you add a class-level comment?

[horo, 2017/04/18 12:53:34]

Done.

+    : public GarbageCollectedFinalized<WorkerFetchContextInfo>,
+      public Supplement<WorkerClients> {
+  USING_GARBAGE_COLLECTED_MIXIN(WorkerFetchContextInfo);
+
+ public:
+  static WorkerFetchContextInfo* From(WorkerClients& clients) {
+    return static_cast<WorkerFetchContextInfo*>(
+        Supplement<WorkerClients>::From(clients, SupplementName()));
+  }
+  static const char* SupplementName() { return "WorkerFetchContextInfo"; }
+
+  explicit WorkerFetchContextInfo(
+      std::unique_ptr<WebWorkerFetchContext> web_context)
+      : web_context_(std::move(web_context)) {}
+  virtual ~WorkerFetchContextInfo() {}
+
+  std::unique_ptr<WebWorkerFetchContext> TakeContext() {
+    return std::move(web_context_);
+  }
+
+  DEFINE_INLINE_VIRTUAL_TRACE() { Supplement<WorkerClients>::Trace(visitor); }
+
+ private:
+  std::unique_ptr<WebWorkerFetchContext> web_context_;
+};
+
+}  // namespace
+
+WorkerFetchContext::~WorkerFetchContext() {}
+
+WorkerFetchContext* WorkerFetchContext::Create(
+    WorkerGlobalScope& worker_global_scope) {
+  WorkerClients* worker_clients = worker_global_scope.Clients();
+  DCHECK(worker_clients);
+  WorkerFetchContextInfo* context_info =
+      static_cast<WorkerFetchContextInfo*>(Supplement<WorkerClients>::From(
+          *worker_clients, WorkerFetchContextInfo::SupplementName()));
+  if (!context_info)
+    return nullptr;
+  std::unique_ptr<WebWorkerFetchContext> web_context =
+      context_info->TakeContext();
+  DCHECK(web_context);
+  return new WorkerFetchContext(std::move(web_context));
+}
+
+WorkerFetchContext::WorkerFetchContext(
+    std::unique_ptr<WebWorkerFetchContext> web_context)
+    : web_context_(std::move(web_context)) {
+  web_context_->InitializeOnWorkerThread(Platform::Current()
+                                             ->CurrentThread()
+                                             ->Scheduler()
+                                             ->LoadingTaskRunner()
+                                             ->ToSingleThreadTaskRunner());
+}
+
+WebURLLoader* WorkerFetchContext::CreateURLLoader() {
+  return web_context_->CreateURLLoader();
+}
+
+bool WorkerFetchContext::IsControlledByServiceWorker() const {
+  return web_context_->IsControlledByServiceWorker();
+}
+
+void WorkerFetchContext::PrepareRequest(ResourceRequest& request,
+                                        RedirectType) {
+  WrappedResourceRequest webreq(request);
+  web_context_->WillSendRequest(webreq);
+}
+
+void ProvideWorkerFetchContextToWorker(
+    WorkerClients* clients,
+    std::unique_ptr<WebWorkerFetchContext> web_context) {
+  DCHECK(clients);
+  WorkerFetchContextInfo::ProvideTo(
+      *clients, WorkerFetchContextInfo::SupplementName(),
+      new WorkerFetchContextInfo(std::move(web_context)));
+}
+
+}  // namespace blink