Set the requester context info to the requests for off-main-thread-fetch.

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

Index: third_party/WebKit/Source/core/loader/WorkerFetchContext.cpp
diff --git a/third_party/WebKit/Source/core/loader/WorkerFetchContext.cpp b/third_party/WebKit/Source/core/loader/WorkerFetchContext.cpp
index d4830069f643e0b183069986e0f4e13af1dbf27d..1032702193fa0737e234365691cf2c7146b4b08e 100644
--- a/third_party/WebKit/Source/core/loader/WorkerFetchContext.cpp
+++ b/third_party/WebKit/Source/core/loader/WorkerFetchContext.cpp
@@ -165,6 +165,8 @@ bool WorkerFetchContext::IsControlledByServiceWorker() const {
 void WorkerFetchContext::PrepareRequest(ResourceRequest& request,
                                         RedirectType) {
   request.OverrideLoadingIPCType(WebURLRequest::LoadingIPCType::kMojo);
+  if (request.RequestorOrigin()->IsUnique())
+    request.SetRequestorOrigin(worker_global_scope_->GetSecurityOrigin());
   WrappedResourceRequest webreq(request);
   web_context_->WillSendRequest(webreq);
 }