VP-297: Fix to timing of tests that failed in Chrome and Safari
Merge remote-tracking branch 'jon/VP-323' into VP-297
VP-297: Updating the light-grey-on-dark-grey css
VP-297: Fix native video support test, to avoid conflicting with safari animated controllers test
VP-297: Get rid of demands block for media events binder
VP-323:
- Added dark-grey on light-grey icons.
- Updated CSS to use these icons for light-grey on dark-grey focus styling.