Start probes only after network is connected.

webrtc/video/video_send_stream_tests.cc

Index: webrtc/video/video_send_stream_tests.cc
diff --git a/webrtc/video/video_send_stream_tests.cc b/webrtc/video/video_send_stream_tests.cc
index cc76b13515a54c33a7dce5667c03691b28f8b40b..b4df5589804cebe1a082fd714c3318fa63317dd2 100644
--- a/webrtc/video/video_send_stream_tests.cc
+++ b/webrtc/video/video_send_stream_tests.cc
@@ -1836,6 +1836,8 @@ TEST_F(VideoSendStreamTest, VideoSendStreamStopSetEncoderRateToZero) {
   test::NullTransport transport;
   CreateSendConfig(1, 0, 0, &transport);
 
+  sender_call_->SignalChannelNetworkState(MediaType::VIDEO, kNetworkUp);
+
   StartStopBitrateObserver encoder;
   video_send_config_.encoder_settings.encoder = &encoder;
   video_send_config_.encoder_settings.internal_source = true;