Let alr dectector use a budged to detect underuse.

webrtc/video/full_stack_tests.cc

 /*
  *  Copyright (c) 2013 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.
  */
 #include <stdio.h>
@@ skipping 13 matching lines @@
  public:
   void RunTest(const VideoQualityTest::Params &params) {
     RunWithAnalyzer(params);
   }
 
  protected:
   const std::string kScreenshareSimulcastExperiment =
       "WebRTC-SimulcastScreenshare/Enabled/";
   const std::string kAlrProbingExperiment =
       std::string(AlrDetector::kScreenshareProbingBweExperimentName) +
-      "/1.1-2875-80-90/";
+      "/1.1,2875,85,20,-20/";
 };
 
 // VideoQualityTest::Params params = {
 //   { ... },      // Common.
 //   { ... },      // Video-specific settings.
 //   { ... },      // Screenshare-specific settings.
 //   { ... },      // Analyzer settings.
 //   pipe,         // FakeNetworkPipe::Config
 //   { ... },      // Spatial scalability.
 //   logs          // bool
@@ skipping 710 matching lines @@
   std::vector<VideoStream> streams = {DefaultVideoStream(video_params_low),
                                       DefaultVideoStream(video_params_medium),
                                       DefaultVideoStream(video_params_high)};
   large_room.num_thumbnails = 50;
   large_room.ss = {streams, 2, 1, 0, std::vector<SpatialLayer>(), false};
   RunTest(large_room);
 }
 
 
 }  // namespace webrtc