Add delay to allow Chrome to load above splash in verified mode

Also, add a delay in the non devmode case to help make the
transition smooth when in verified mode as well.  This
change also increases the delay to 8 seconds to allow chrome
enough time to draw itself above the splash.

BUG=chromium:455605
TEST=verified on link

Change-Id: Ib0086e4c36df7b2d5c8fd78c027bfa4b71cca773
Previous-Reviewed-on: https://chromium-review.googlesource.com/251056
Trybot-Ready: David Sodman <dsodman@chromium.org>
(cherry picked from commit dd5b23eb9a0c8862fcde70652c9bae4acc483865)
Reviewed-on: https://chromium-review.googlesource.com/252921
Reviewed-by: David Sodman <dsodman@chromium.org>
Tested-by: David Sodman <dsodman@chromium.org>
1 file changed