Update default parameters in screenshare_loopback test

webrtc/video/screenshare_loopback.cc

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 23 matching lines @@
 DEFINE_int32(fps, 5, "Frames per second.");
 int Fps() {
   return static_cast<int>(FLAGS_fps);
 }
 
 DEFINE_int32(min_bitrate, 50, "Call and stream min bitrate in kbps.");
 int MinBitrateKbps() {
   return static_cast<int>(FLAGS_min_bitrate);
 }
 
-DEFINE_int32(start_bitrate, 200, "Call start bitrate in kbps.");
+DEFINE_int32(start_bitrate,
+             Call::Config::kDefaultStartBitrateBps / 1000,
+             "Call start bitrate in kbps.");
 int StartBitrateKbps() {
   return static_cast<int>(FLAGS_start_bitrate);
 }
 
-DEFINE_int32(target_bitrate, 2000, "Stream target bitrate in kbps.");
+DEFINE_int32(target_bitrate, 200, "Stream target bitrate in kbps.");
 int TargetBitrateKbps() {
   return static_cast<int>(FLAGS_target_bitrate);
 }
 
 DEFINE_int32(max_bitrate, 2000, "Call and stream max bitrate in kbps.");
 int MaxBitrateKbps() {
   return static_cast<int>(FLAGS_max_bitrate);
 }
 
 DEFINE_int32(num_temporal_layers, 2, "Number of temporal layers to use.");
@@ skipping 195 matching lines @@
 }  // namespace webrtc
 
 int main(int argc, char* argv[]) {
   ::testing::InitGoogleTest(&argc, argv);
   google::ParseCommandLineFlags(&argc, &argv, true);
   webrtc::test::InitFieldTrialsFromString(
       webrtc::flags::FLAGS_force_fieldtrials);
   webrtc::test::RunTest(webrtc::Loopback);
   return 0;
 }