Reimplemeted "Test and fix for huge bwe drop after alr state"

webrtc/modules/congestion_controller/send_side_congestion_controller.cc

Index: webrtc/modules/congestion_controller/send_side_congestion_controller.cc
diff --git a/webrtc/modules/congestion_controller/send_side_congestion_controller.cc b/webrtc/modules/congestion_controller/send_side_congestion_controller.cc
index 60e692ccdfe46c4ea3e04b110a31448af0da7ea0..299f47223c8937cfd715e44a938ef4d4b4cfe8a2 100644
--- a/webrtc/modules/congestion_controller/send_side_congestion_controller.cc
+++ b/webrtc/modules/congestion_controller/send_side_congestion_controller.cc
@@ -15,16 +15,19 @@
 #include <vector>
 
 #include "webrtc/modules/bitrate_controller/include/bitrate_controller.h"
-#include "webrtc/modules/congestion_controller/acknowledge_bitrate_estimator.h"
+#include "webrtc/modules/congestion_controller/acknowledged_bitrate_estimator.h"
 #include "webrtc/modules/congestion_controller/probe_controller.h"
+#include "webrtc/modules/pacing/alr_detector.h"
 #include "webrtc/modules/remote_bitrate_estimator/include/bwe_defines.h"
 #include "webrtc/rtc_base/checks.h"
 #include "webrtc/rtc_base/logging.h"
 #include "webrtc/rtc_base/ptr_util.h"
 #include "webrtc/rtc_base/rate_limiter.h"
 #include "webrtc/rtc_base/socket.h"
+#include "webrtc/rtc_base/timeutils.h"
 
 namespace webrtc {
+
 namespace {
 
 static const int64_t kRetransmitWindowSizeMs = 500;
@@ -277,6 +280,14 @@ void SendSideCongestionController::OnTransportFeedback(
   std::vector<PacketFeedback> feedback_vector = ReceivedPacketFeedbackVector(
       transport_feedback_adapter_.GetTransportFeedbackVector());
   SortPacketFeedbackVector(&feedback_vector);
+
+  rtc::Optional<int64_t> alr_start_time_ms =

[terelius, 2017/07/14 15:44:52]

If we are never going to use the value, could we change it to booleans
currently_in_alr and was_in_alr?

[tschumi, 2017/07/17 06:41:04]

Done.

+      pacer_->GetApplicationLimitedRegionStartTime();
+  if (!alr_start_time_ms && last_alr_start_time_ms_) {
+    acknowledged_bitrate_estimator_->SetAlrEndedTimeMs(rtc::TimeMillis());
+  }
+  last_alr_start_time_ms_ = alr_start_time_ms;
+
   acknowledged_bitrate_estimator_->IncomingPacketFeedbackVector(
       feedback_vector);
   DelayBasedBwe::Result result;