Enable probing with repeated payload packets by default.

webrtc/modules/pacing/paced_sender.cc

 /*
  *  Copyright (c) 2012 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 343 matching lines @@
         if (prober_->IsProbing()) {
           return 0;
         }
       } else {
         // Send failed, put it back into the queue.
         packets_->CancelPop(packet);
         return 0;
       }
     }
 
+    if (!packets_->Empty())
+      return 0;
+
     size_t padding_needed;
-    if (prober_->IsProbing() && ProbingExperimentIsEnabled())
+    if (prober_->IsProbing())
       padding_needed = prober_->RecommendedPacketSize();
     else
       padding_needed = padding_budget_->bytes_remaining();
 
     if (padding_needed > 0)
       SendPadding(static_cast<size_t>(padding_needed));
   }
   return 0;
 }
 
@@ skipping 24 matching lines @@
     prober_->PacketSent(clock_->TimeInMilliseconds(), bytes_sent);
     media_budget_->UseBudget(bytes_sent);
     padding_budget_->UseBudget(bytes_sent);
   }
 }
 
 void PacedSender::UpdateBytesPerInterval(int64_t delta_time_ms) {
   media_budget_->IncreaseBudget(delta_time_ms);
   padding_budget_->IncreaseBudget(delta_time_ms);
 }
-
-bool PacedSender::ProbingExperimentIsEnabled() const {
-  return webrtc::field_trial::FindFullName("WebRTC-BitrateProbing") ==
-         "Enabled";
-}
 }  // namespace webrtc