Add video texture sample#52

Merged

austinEng merged 3 commits intowebgpu:masterfrom

shaoboyan:video-uploading

Sep 17, 2020

Commits on Sep 4, 2020

Add video texture sample
shaoboyan
committed

Commits on Sep 16, 2020

Make video smooth:
shaoboyan
committed

Commits on Sep 17, 2020

Remove the condition to skip videoFrames because it is always true.
shaoboyan
committed