VideoHero:Video Player

Build 4307 on 23-01-DC-feat-video-children-count
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Baseline History
Build 43070e0c352
Current build. There are unaccepted changes, so build 4285 is still the baseline.
Build 42802afa95e
Accepted by Siyang Cao.
Build 42723efe168
Auto-accepted
Build 4260d19e45d
Auto-accepted
Commenting is disabled because there's a newer build on this branch