Move key frame flag from StreamParserBuffer to DecoderBuffer

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 b8665efeb3be30f403f78b14fb22761bd64fc247..227cd6aad27c5198bcab5d4d4341301d43397af2 100644
--- a/media/filters/ffmpeg_demuxer.cc
+++ b/media/filters/ffmpeg_demuxer.cc
@@ -360,6 +360,9 @@ void FFmpegDemuxerStream::EnqueuePacket(ScopedAVPacket packet) {
     }
   }
 
+  if (packet.get()->flags & AV_PKT_FLAG_KEY)
+    buffer->set_is_key_frame(true);
+
   last_packet_timestamp_ = buffer->timestamp();
   last_packet_duration_ = buffer->duration();