Logic for finding frame references moved from PacketBuffer to new class

webrtc/modules/video_coding/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 41 matching lines @@
     "packet.h",
     "packet_buffer.cc",
     "packet_buffer.h",
     "percentile_filter.cc",
     "percentile_filter.h",
     "qm_select.cc",
     "qm_select.h",
     "qm_select_data.h",
     "receiver.cc",
     "receiver.h",
+    "rtp_frame_reference_finder.cc",
+    "rtp_frame_reference_finder.h",
     "rtt_filter.cc",
     "rtt_filter.h",
     "session_info.cc",
     "session_info.h",
     "timestamp_map.cc",
     "timestamp_map.h",
     "timing.cc",
     "timing.h",
     "video_coding_impl.cc",
     "video_coding_impl.h",
@@ skipping 187 matching lines @@
 
   deps = [
     ":video_coding_utility",
     "../../common_video",
     "../../system_wrappers",
   ]
   if (rtc_build_libvpx) {
     deps += [ rtc_libvpx_dir ]
   }
 }