Add load flag indicating a request is probably the result of a user gesture.

net/url_request/url_request_http_job.cc

Index: net/url_request/url_request_http_job.cc
diff --git a/net/url_request/url_request_http_job.cc b/net/url_request/url_request_http_job.cc
index a98ca5de702e209324b310e0ade5633a3db01639..a5c1edf4b8ce0ee4c051f0b1ca1a2be2a065fd76 100644
--- a/net/url_request/url_request_http_job.cc
+++ b/net/url_request/url_request_http_job.cc
@@ -397,7 +397,7 @@ void URLRequestHttpJob::StartTransactionInternal() {
         &transaction_);
     if (rv == OK) {
       if (!URLRequestThrottlerManager::GetInstance()->enforce_throttling() ||
-          !throttling_entry_->IsDuringExponentialBackoff()) {
+          !throttling_entry_->ShouldRejectRequest(request_info_.load_flags)) {
         rv = transaction_->Start(
             &request_info_, &start_callback_, request_->net_log());
         start_time_ = base::TimeTicks::Now();