Reland of "Change type of pid_diff (int16_t -> uint8_t) according to updates in RTP payload profile…

webrtc/modules/video_coding/main/source/session_info.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 108 matching lines @@
       packets_.front().codecSpecificHeader.codec != kRtpVideoVp9 ||
       packets_.front().codecSpecificHeader.codecHeader.VP9.flexible_mode) {
     return;
   }
   packets_.front().codecSpecificHeader.codecHeader.VP9.temporal_idx =
       gof_info.temporal_idx[idx];
   packets_.front().codecSpecificHeader.codecHeader.VP9.temporal_up_switch =
       gof_info.temporal_up_switch[idx];
   packets_.front().codecSpecificHeader.codecHeader.VP9.num_ref_pics =
       gof_info.num_ref_pics[idx];
-  for (size_t i = 0; i < gof_info.num_ref_pics[idx]; ++i) {
+  for (uint8_t i = 0; i < gof_info.num_ref_pics[idx]; ++i) {
     packets_.front().codecSpecificHeader.codecHeader.VP9.pid_diff[i] =
         gof_info.pid_diff[idx][i];
   }
 }
 
 void VCMSessionInfo::Reset() {
   session_nack_ = false;
   complete_ = false;
   decodable_ = false;
   frame_type_ = kVideoFrameDelta;
@@ skipping 431 matching lines @@
   if (empty_seq_num_high_ == -1)
     empty_seq_num_high_ = seq_num;
   else
     empty_seq_num_high_ = LatestSequenceNumber(seq_num, empty_seq_num_high_);
   if (empty_seq_num_low_ == -1 || IsNewerSequenceNumber(empty_seq_num_low_,
                                                         seq_num))
     empty_seq_num_low_ = seq_num;
 }
 
 }  // namespace webrtc