CardPreview:Add Button

Build 2758 on 22-07-JG-feat-video-url-to-video
1200px
Reviewing disabled
Baseline History
Build 275824f8113
Current build. There are unaccepted changes, so build 2453 is still the baseline.
Build 24446a720de
Accepted by John Geronimo.
Build 24002d7bb79
Accepted by Siyang Cao.
Build 233537c0e1d
Accepted by Tataihono Nikora.
Commenting is disabled because there's a newer build on this branch