Chrome Version: 71.0.3578.0
OS: Linux

What steps will reproduce the problem?
(1) Open provided trace
(2) Search for DecoderSelector

What is the expected result?

There should be two async DecoderSelector::SelectDecoder events, one for audio and one for video.

First is:
  {"pid":9684,"tid":9748,"ts":1111622019391,"ph":"S","cat":"media","name":"DecoderSelector::SelectDecoder","args":{"type":"audio","config":"codec: aac, bytes_per_channel: 2, channel_layout: 3, channels: 2, samples_per_second: 48000, sample_format: 2, bytes_per_frame: 4, seek_preroll: 0us, codec_delay: 0, has extra data: true, encryption scheme: CENC, discard decoder delay: false"},"tts":3775,"id":"0xaf47894c4bc2d283"},

Second is:

{"pid":9684,"tid":9748,"ts":1111622235298,"ph":"S","cat":"media","name":"DecoderSelector::SelectDecoder","args":{"type":"video","config":"codec: h264, format: PIXEL_FORMAT_I420, profile: h264 baseline, coded size: [640,360], visible rect: [0,0,640,360], natural size: [640,360], has extra data: false, encryption scheme: CENC, rotation: 0°"},"tts":5444,"id":"0xaf47894c4bc2f403"},

What happens instead?

Only the audio event is visible and searchable. A step from the video event is visible, though, which is:

{"pid":9684,"tid":9748,"ts":1111622332759,"ph":"F","cat":"media","name":"DecoderSelector::SelectDecoder","args":{"type":"video","decoder":"MojoVideoDecoder (unencrypted)"},"tts":6480,"id":"0xaf47894c4bc2f403"},
 

Deleted: trace_test.json.gz 1.4 MB

trace_test.json.gz 1.4 MB Download

Deleted: Screenshot from 2018-10-11 13-25-55.png 136 KB

	Screenshot from 2018-10-11 13-25-55.png 136 KB View Download