Added implementation of three classes in BBR,with unit-tests.

webrtc/modules/remote_bitrate_estimator/test/estimators/max_bandwidth_filter.h

Index: webrtc/modules/remote_bitrate_estimator/test/estimators/max_bandwidth_filter.h
diff --git a/webrtc/modules/remote_bitrate_estimator/test/estimators/max_bandwidth_filter.h b/webrtc/modules/remote_bitrate_estimator/test/estimators/max_bandwidth_filter.h
index 01c367cab79c90edead0ea91278da57b71ce5555..5d40404344978987e97e0f33ee2b1746302d9081 100644
--- a/webrtc/modules/remote_bitrate_estimator/test/estimators/max_bandwidth_filter.h
+++ b/webrtc/modules/remote_bitrate_estimator/test/estimators/max_bandwidth_filter.h
@@ -12,6 +12,7 @@
 #ifndef WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TEST_ESTIMATORS_MAX_BANDWIDTH_FILTER_H_
 #define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TEST_ESTIMATORS_MAX_BANDWIDTH_FILTER_H_
 
+#include <cstddef>
 #include <cstdint>
 
 namespace webrtc {
@@ -24,11 +25,9 @@ class MaxBandwidthFilter {
   ~MaxBandwidthFilter();
   int64_t max_bandwidth_estimate() { return max_bandwidth_estimate_; }
 
-  // Save bandwidth sample for the current round.
-  // We save bandwidth samples for past 10 rounds to
-  // provide better bandwidth estimate.
-
-  void AddBandwidthSample(int64_t sample, int64_t round);
+  // Save bandwidth sample for the current round. We save bandwidth samples for
+  // past 10 rounds to provide better bandwidth estimate.
+  void AddBandwidthSample(int64_t sample, int64_t round, size_t filter_size);
 
   // Check if bandwidth has grown by certain multiplier for past x rounds,
   // to decide whether or not full bandwidth was reached.
@@ -36,6 +35,7 @@ class MaxBandwidthFilter {
 
  private:
   int64_t bandwidth_last_round_;
+  uint64_t round_bandwidth_updated_;
   int64_t max_bandwidth_estimate_;
   int64_t rounds_without_growth_;
 };