Pass time constant to bwe smoothing filter.

webrtc/modules/congestion_controller/delay_based_bwe_unittest.cc

 /*
  *  Copyright (c) 2016 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 98 matching lines @@
     clock_.AdvanceTimeMilliseconds(2);
     send_time_ms += 1;
     now_ms = clock_.TimeInMilliseconds();
     IncomingFeedback(now_ms, send_time_ms, seq_num++, 1000, 1);
   }
 
   EXPECT_TRUE(bitrate_observer_.updated());
   EXPECT_NEAR(bitrate_observer_.latest_bitrate(), 4000000u, 10000u);
 }
 
+TEST_F(DelayBasedBweTest, GetProbingInterval) {
+  int64_t default_interval_ms = bitrate_estimator_->GetProbingIntervalMs();
+  EXPECT_GT(default_interval_ms, 0);
+  CapacityDropTestHelper(1, true, 567, 0);
+  int64_t interval_ms = bitrate_estimator_->GetProbingIntervalMs();
+  EXPECT_GT(interval_ms, 0);
+  EXPECT_NE(interval_ms, default_interval_ms);
+}
+
 TEST_F(DelayBasedBweTest, InitialBehavior) {
   InitialBehaviorTestHelper(674840);
 }
 
 TEST_F(DelayBasedBweTest, RateIncreaseReordering) {
   RateIncreaseReorderingTestHelper(674840);
 }
 
 TEST_F(DelayBasedBweTest, RateIncreaseRtpTimestamps) {
   RateIncreaseRtpTimestampsTestHelper(1240);
@@ skipping 60 matching lines @@
 }
 
 TEST_F(DelayBasedBweExperimentTest, CapacityDropNegOffsetChange) {
   CapacityDropTestHelper(1, false, 300, -30000);
 }
 
 TEST_F(DelayBasedBweExperimentTest, CapacityDropOneStreamWrap) {
   CapacityDropTestHelper(1, true, 333, 0);
 }
 }  // namespace webrtc