Make sure videoCurTime is loaded when accessing it in VideoSanity test

There were few failures where JS throws a ReferenceError for videoCurTime
on PFQs

BUG=chromium:470913
TEST=cbuildbot

Change-Id: I5ddd239df62d4a17daeaaeb6cf2b060e53440f22
Reviewed-on: https://chromium-review.googlesource.com/272674
Reviewed-by: Rohit Makasana <rohitbm@chromium.org>
Commit-Queue: Toni Barzic <tbarzic@chromium.org>
Tested-by: Toni Barzic <tbarzic@chromium.org>
1 file changed