Chrome Version: 64.0.3282.24
Chrome OS Version: 10176.13.0
Chrome OS Platform: All
Network info: Wifi

Please specify Cr-* of the system to which this bug/feature applies (add
the label below).

Steps To Reproduce:
(1) Open https://storage.googleapis.com/chromiumos-test-assets-public/Shaka-Dash/480.mp4
Or open any local audio or video
(2) Observe video/audio
(3)

Expected Result:
Video/audio start playing

Actual Result:
-- Not playing
-- Need to play manually 
How frequently does this problem reproduce? (Always, sometimes, hard to
reproduce?)
Always

Please provide any additional information below. Attach a screen shot or
log if possible.
this behavior is working as intended in 10176.5.0/64.0.3282.11