Implemented HEVC video demuxing and parsing

media/filters/ffmpeg_demuxer.cc

Index: media/filters/ffmpeg_demuxer.cc
diff --git a/media/filters/ffmpeg_demuxer.cc b/media/filters/ffmpeg_demuxer.cc
index be31709b05017603df7c655e6e06e417eaef997e..adfeb23f27c78ecd6948235183cca666dccbfe37 100644
--- a/media/filters/ffmpeg_demuxer.cc
+++ b/media/filters/ffmpeg_demuxer.cc
@@ -32,6 +32,9 @@
 #include "media/filters/ffmpeg_bitstream_converter.h"
 #include "media/filters/ffmpeg_glue.h"
 #include "media/filters/ffmpeg_h264_to_annex_b_bitstream_converter.h"
+#if defined(ENABLE_HEVC_DEMUXING)
+#include "media/filters/ffmpeg_h265_to_annex_b_bitstream_converter.h"
+#endif
 #include "media/filters/webvtt_util.h"
 #include "media/formats/webm/webm_crypto_helpers.h"
 
@@ -460,6 +463,11 @@ void FFmpegDemuxerStream::InitBitstreamConverter() {
   if (stream_->codec->codec_id == AV_CODEC_ID_H264) {
     bitstream_converter_.reset(
         new FFmpegH264ToAnnexBBitstreamConverter(stream_->codec));
+#if defined(ENABLE_HEVC_DEMUXING)
+  } else if (stream_->codec->codec_id == AV_CODEC_ID_HEVC) {
+    bitstream_converter_.reset(
+        new FFmpegH265ToAnnexBBitstreamConverter(stream_->codec));
+#endif
   } else if (stream_->codec->codec_id == AV_CODEC_ID_AAC) {
     bitstream_converter_.reset(
         new FFmpegAACBitstreamConverter(stream_->codec));