Implement the infrastructure of creating WorkerFetchContext in worker global scope.

third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp

Index: third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp b/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
index 6acd6833d14aa1989cea9188bbb255a3c6f07ea9..1882bf9fc7a0318e5d9773b06b68e9d51f676039 100644
--- a/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
@@ -38,6 +38,7 @@
 #include "core/inspector/ConsoleMessage.h"
 #include "core/loader/FrameLoadRequest.h"
 #include "core/loader/ThreadableLoadingContext.h"
+#include "core/loader/WorkerFetchContext.h"
 #include "core/probe/CoreProbes.h"
 #include "core/workers/ParentFrameTaskRunners.h"
 #include "core/workers/WorkerClients.h"
@@ -433,6 +434,17 @@ void WebEmbeddedWorkerImpl::StartWorkerThread() {
       worker_clients,
       WTF::WrapUnique(worker_context_client_->CreateServiceWorkerProvider()));
 
+  std::unique_ptr<WebWorkerFetchContext> web_worker_fetch_context =

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

ditto.

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

Done.

+      WTF::WrapUnique(
+          worker_context_client_->CreateServiceWorkerFetchContext());
+  // |web_worker_fetch_context| is null if off-main-thread-fetch is disabled.
+  if (web_worker_fetch_context) {
+    // TODO(horo): Set more information about the context (ex: DataSaverEnabled)
+    // to |web_worker_fetch_context|.
+    ProvideWorkerFetchContextToWorker(worker_clients,
+                                      std::move(web_worker_fetch_context));
+  }
+
   // We need to set the CSP to both the shadow page's document and the
   // ServiceWorkerGlobalScope.
   document->InitContentSecurityPolicy(