Add support for writing raw encoder output to .ivf files.

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 89 matching lines @@
     "../..:webrtc_common",
     "../../common_video",
     "../../system_wrappers",
   ]
 }
 
 source_set("video_coding_utility") {
   sources = [
     "utility/frame_dropper.cc",
     "utility/frame_dropper.h",
+    "utility/ivf_file_writer.cc",
+    "utility/ivf_file_writer.h",
     "utility/moving_average.h",
     "utility/qp_parser.cc",
     "utility/qp_parser.h",
     "utility/quality_scaler.cc",
     "utility/quality_scaler.h",
     "utility/vp8_header_parser.cc",
     "utility/vp8_header_parser.h",
   ]
 
   configs += [ "../..:common_config" ]
@@ skipping 139 matching lines @@
 
   deps = [
     ":video_coding_utility",
     "../../common_video",
     "../../system_wrappers",
   ]
   if (rtc_build_libvpx) {
     deps += [ rtc_libvpx_dir ]
   }
 }