Implement the infrastructure of creating WorkerFetchContext in worker global scope.

third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp

Index: third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp b/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
index 9f0e0963d6edaa02f0cde45b4c88bd069791d8ba..798288a467d87b772f869643deb7088c8c91e380 100644
--- a/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
@@ -37,6 +37,7 @@
 #include "core/loader/FrameLoadRequest.h"
 #include "core/loader/FrameLoader.h"
 #include "core/loader/ThreadableLoadingContext.h"
+#include "core/loader/WorkerFetchContext.h"
 #include "core/probe/CoreProbes.h"
 #include "core/workers/ParentFrameTaskRunners.h"
 #include "core/workers/SharedWorkerGlobalScope.h"
@@ -339,6 +340,18 @@ void WebSharedWorkerImpl::OnScriptLoaderFinished() {
           web_security_origin)));
   ProvideIndexedDBClientToWorker(worker_clients,
                                  IndexedDBClientImpl::Create(*worker_clients));
+
+  std::unique_ptr<WebWorkerFetchContextInfo> web_worker_fetch_context_info =
+      Platform::Current()->CreateWorkerFetchContextInfo();
+  // |web_worker_fetch_context_info| is null if off-main-thread-fetch is
+  // disabled.
+  if (web_worker_fetch_context_info) {
+    // TODO(horo): Set more information about the context (ex: Service Worker
+    // provider ID) to |web_worker_fetch_context_info|.
+    ProvideWorkerFetchContextInfoToWorker(
+        worker_clients, std::move(web_worker_fetch_context_info));
+  }
+
   ContentSecurityPolicy* content_security_policy =
       main_script_loader_->ReleaseContentSecurityPolicy();
   WorkerThreadStartMode start_mode =