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 {
+
+// WorkerFetchContextHolder is used to pass the WebWorkerFetchContext from the
+// main thread to the worker thread by attaching to the WorkerClients as a
+// Supplement.
+class WorkerFetchContextHolder final
+    : public GarbageCollectedFinalized<WorkerFetchContextHolder>,
+      public Supplement<WorkerClients> {
+  USING_GARBAGE_COLLECTED_MIXIN(WorkerFetchContextHolder);
+
+ public:
+  static WorkerFetchContextHolder* From(WorkerClients& clients) {
+    return static_cast<WorkerFetchContextHolder*>(
+        Supplement<WorkerClients>::From(clients, SupplementName()));
+  }
+  static const char* SupplementName() { return "WorkerFetchContextHolder"; }
+
+  explicit WorkerFetchContextHolder(
+      std::unique_ptr<WebWorkerFetchContext> web_context)
+      : web_context_(std::move(web_context)) {}
+  virtual ~WorkerFetchContextHolder() {}
+
+  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) {

[nhiroki, 2017/04/20 04:16:07]

Can you add DCHECK(worker_global_scope->IsContextThread()) here?

[horo, 2017/04/20 08:35:43]

Done.

+  WorkerClients* worker_clients = worker_global_scope.Clients();
+  DCHECK(worker_clients);
+  WorkerFetchContextHolder* holder =
+      static_cast<WorkerFetchContextHolder*>(Supplement<WorkerClients>::From(
+          *worker_clients, WorkerFetchContextHolder::SupplementName()));
+  if (!holder)
+    return nullptr;
+  std::unique_ptr<WebWorkerFetchContext> web_context = holder->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()

[nhiroki, 2017/04/20 04:16:07]

The GlobalScopeScheduler patch was landed. Can you update this part as I
commented before?

[nhiroki, 2017/04/20 04:17:33]

Hmm..., this was reverted. Please ignore this comment for now.

+                                             ->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);
+  WorkerFetchContextHolder::ProvideTo(
+      *clients, WorkerFetchContextHolder::SupplementName(),
+      new WorkerFetchContextHolder(std::move(web_context)));
+}
+
+}  // namespace blink