Add statistics gathering for packet loss.

webrtc/modules/rtp_rtcp/BUILD.gn

 # Copyright (c) 2014 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.
 
 import("../../build/webrtc.gni")
 
@@ skipping 17 matching lines @@
     "source/fec_private_tables_random.h",
     "source/fec_receiver_impl.cc",
     "source/fec_receiver_impl.h",
     "source/forward_error_correction.cc",
     "source/forward_error_correction.h",
     "source/forward_error_correction_internal.cc",
     "source/forward_error_correction_internal.h",
     "source/h264_sps_parser.cc",
     "source/h264_sps_parser.h",
     "source/mock/mock_rtp_payload_strategy.h",
+    "source/packet_loss_stats.cc",
+    "source/packet_loss_stats.h",
     "source/producer_fec.cc",
     "source/producer_fec.h",
     "source/receive_statistics_impl.cc",
     "source/receive_statistics_impl.h",
     "source/remote_ntp_time_estimator.cc",
     "source/rtcp_packet.cc",
     "source/rtcp_packet.h",
     "source/rtcp_receiver.cc",
     "source/rtcp_receiver.h",
     "source/rtcp_receiver_help.cc",
@@ skipping 63 matching lines @@
   if (is_win) {
     cflags = [
       # TODO(jschuh): Bug 1348: fix this warning.
       "/wd4267",  # size_t to int truncations
 
       # TODO(kjellander): Bug 261: fix this warning.
       "/wd4373",  # virtual function override.
     ]
   }
 }