Add NetLog events for HttpStreamFactoryImpl::Job throttle logic

net/http/http_stream_factory_impl_job.cc

Index: net/http/http_stream_factory_impl_job.cc
diff --git a/net/http/http_stream_factory_impl_job.cc b/net/http/http_stream_factory_impl_job.cc
index bc93ca9a94587f4f030974916248c2c829fe9b47..37b29b7e55bce054f8c189930608afb8ecb82e82 100644
--- a/net/http/http_stream_factory_impl_job.cc
+++ b/net/http/http_stream_factory_impl_job.cc
@@ -804,12 +804,14 @@ int HttpStreamFactoryImpl::Job::DoEvaluateThrottle() {
   }
   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE, callback, base::TimeDelta::FromMilliseconds(kHTTP2ThrottleMs));
+  net_log_.AddEvent(NetLogEventType::HTTP_STREAM_JOB_THROTTLED);
   return ERR_IO_PENDING;
 }
 
 void HttpStreamFactoryImpl::Job::ResumeInitConnection() {
   if (init_connection_already_resumed_)
     return;
+  net_log_.AddEvent(NetLogEventType::HTTP_STREAM_JOB_RESUME_INIT_CONNECTION);
   // TODO(xunjieli): Change this to a DCHECK once crbug.com/718576 is stable.
   CHECK_EQ(next_state_, STATE_INIT_CONNECTION);
   init_connection_already_resumed_ = true;