[Net] Propagate priority changes from URLRequest to HttpTransaction

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 caf344c325363afafb7dd6ed1fa8c42306d93e41..1d71aee29c04a5aea1d34068dded93777b33ec3a 100644
--- a/net/url_request/url_request_http_job.cc
+++ b/net/url_request/url_request_http_job.cc
@@ -1578,6 +1578,12 @@ void URLRequestHttpJob::NotifyURLRequestDestroyed() {
   awaiting_callback_ = false;
 }
 
+void URLRequestHttpJob::SetPriority(RequestPriority priority) {
+  request_info_.priority = priority;
+  if (transaction_)
+    transaction_->SetPriority(priority);
+}
+
 void URLRequestHttpJob::OnDetachRequest() {
   http_transaction_delegate_->OnDetachRequest();
 }