Add congestion window values to GoogCcPrinter

Bug: None
Change-Id: I9a31e9783f3ea8482281285c8454e24eb15f0925
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/146706
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Commit-Queue: Evan Shrubsole <eshr@google.com>
Cr-Commit-Position: refs/heads/master@{#28661}

modules/congestion_controller/goog_cc/test/goog_cc_printer.cc

@@ -124,6 +124,9 @@ std::deque<FieldLogger*> GoogCcStatePrinter::CreateLoggers() {
       Log("loss_based_rate", [=] { return loss_cont()->loss_based_bitrate_; }),
       Log("loss_ack_rate",
           [=] { return loss_cont()->acknowledged_bitrate_max_; }),
+      Log("data_window", [=] { return controller_->current_data_window_; }),
+      Log("pushback_target",
+          [=] { return controller_->last_pushback_target_rate_; }),
   });
   return loggers;
 }