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

net/url_request/url_request_test_util.cc

Index: net/url_request/url_request_test_util.cc
diff --git a/net/url_request/url_request_test_util.cc b/net/url_request/url_request_test_util.cc
index 85d878e74f60f11d2c0d11c2e1e242de9c81fd0e..419816bfa95bd08e12cdc09da861092a8c392726 100644
--- a/net/url_request/url_request_test_util.cc
+++ b/net/url_request/url_request_test_util.cc
@@ -168,10 +168,12 @@ TestDelegate::TestDelegate()
       cancel_in_rd_pending_(false),
       quit_on_complete_(true),
       quit_on_redirect_(false),
+      quit_on_before_network_start_(false),
       allow_certificate_errors_(false),
       response_started_count_(0),
       received_bytes_count_(0),
       received_redirect_count_(0),
+      received_before_network_start_count_(0),
       received_data_before_response_(false),
       request_failed_(false),
       have_certificate_errors_(false),
@@ -206,6 +208,15 @@ void TestDelegate::OnReceivedRedirect(URLRequest* request,
   }
 }
 
+void TestDelegate::OnBeforeNetworkStart(URLRequest* request, bool* defer) {
+  received_before_network_start_count_++;
+  if (quit_on_before_network_start_) {
+    *defer = true;
+    base::MessageLoop::current()->PostTask(FROM_HERE,
+                                           base::MessageLoop::QuitClosure());
+  }
+}
+
 void TestDelegate::OnAuthRequired(URLRequest* request,
                                   AuthChallengeInfo* auth_info) {
   auth_required_ = true;