Allows deferral of a URLRequest just before talking to the network, at

net/url_request/url_request_job.cc

Index: net/url_request/url_request_job.cc
diff --git a/net/url_request/url_request_job.cc b/net/url_request/url_request_job.cc
index 18d59e94e48f04488b66e324d76213caa56bb7a4..7849d3237bf7a85de1653cb356f1f952b56a26ca 100644
--- a/net/url_request/url_request_job.cc
+++ b/net/url_request/url_request_job.cc
@@ -212,6 +212,12 @@ void URLRequestJob::FollowDeferredRedirect() {
   FollowRedirect(redirect_url, redirect_status_code);
 }
 
+void URLRequestJob::ResumeNetworkStart() {
+  // This should only be called for HTTP Jobs, and implemented in the derived
+  // class.
+  NOTREACHED();
+}
+
 bool URLRequestJob::GetMimeType(std::string* mime_type) const {
   return false;
 }
@@ -275,6 +281,13 @@ bool URLRequestJob::CanEnablePrivacyMode() const {
   return request_->CanEnablePrivacyMode();
 }
 
+void URLRequestJob::NotifyBeforeNetworkStart(bool* defer) {
+  if (!request_)
+    return;
+
+  request_->NotifyBeforeNetworkStart(defer);
+}
+
 void URLRequestJob::NotifyHeadersComplete() {
   if (!request_ || !request_->has_delegate())
     return;  // The request was destroyed, so there is no more work to do.