Mark QUIC broken when the network blackholes after the handshake

net/quic/test_tools/test_task_runner.h

Index: net/quic/test_tools/test_task_runner.h
diff --git a/net/quic/test_tools/test_task_runner.h b/net/quic/test_tools/test_task_runner.h
index a7d72e207622f1fd5a275d46db75a87237cbae18..3047b0d1886e8a9f66951aadd88c54cfe27cd2cc 100644
--- a/net/quic/test_tools/test_task_runner.h
+++ b/net/quic/test_tools/test_task_runner.h
@@ -34,8 +34,14 @@ class TestTaskRunner : public base::TaskRunner {
 
   const std::vector<PostedTask>& GetPostedTasks() const;
 
+  // Finds the next task to run, advances the time to the correct time
+  // and then runs the task.
   void RunNextTask();
 
+  // While there are posted tasks, finds the next task to run, advances the
+  // time to the correct time and then runs the task.
+  void RunUntilIdle();
+
  protected:
   ~TestTaskRunner() override;