Implement the infrastructure of creating WorkerFetchContext in worker global scope.

third_party/WebKit/Source/web/DedicatedWorkerMessagingProxyProviderImpl.cpp

Index: third_party/WebKit/Source/web/DedicatedWorkerMessagingProxyProviderImpl.cpp
diff --git a/third_party/WebKit/Source/web/DedicatedWorkerMessagingProxyProviderImpl.cpp b/third_party/WebKit/Source/web/DedicatedWorkerMessagingProxyProviderImpl.cpp
index cf0153e0110d1db11f297b6e16b069a7c93852cc..790b547978fdacffb3584d728dfe0335bf777eb2 100644
--- a/third_party/WebKit/Source/web/DedicatedWorkerMessagingProxyProviderImpl.cpp
+++ b/third_party/WebKit/Source/web/DedicatedWorkerMessagingProxyProviderImpl.cpp
@@ -31,12 +31,16 @@
 #include "web/DedicatedWorkerMessagingProxyProviderImpl.h"
 
 #include "core/dom/Document.h"
+#include "core/loader/WorkerFetchContext.h"
 #include "core/workers/DedicatedWorkerMessagingProxy.h"
 #include "core/workers/Worker.h"
 #include "core/workers/WorkerClients.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "platform/wtf/PtrUtil.h"
+#include "public/platform/Platform.h"
 #include "public/platform/WebContentSettingsClient.h"
 #include "public/platform/WebString.h"
+#include "public/platform/WebWorkerFetchContext.h"
 #include "public/web/WebFrameClient.h"
 #include "public/web/WebWorkerContentSettingsClientProxy.h"
 #include "web/IndexedDBClientImpl.h"
@@ -67,6 +71,15 @@ DedicatedWorkerMessagingProxyProviderImpl::CreateWorkerMessagingProxy(
         worker_clients,
         WTF::WrapUnique(
             web_frame->Client()->CreateWorkerContentSettingsClientProxy()));
+    if (RuntimeEnabledFeatures::offMainThreadFetchEnabled()) {
+      std::unique_ptr<WebWorkerFetchContext> web_worker_fetch_context =
+          WTF::WrapUnique(web_frame->Client()->CreateWorkerFetchContext());
+      DCHECK(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));
+    }
     // FIXME: call provideServiceWorkerContainerClientToWorker here when we
     // support ServiceWorker in dedicated workers (http://crbug.com/371690)
     return new DedicatedWorkerMessagingProxy(worker, worker_clients);