Also add a new test for UBOs to end2end_tests.

BUG=540538

Change-Id: I6ffa6ba061a2c33811c65719deaa4302f1dbd704
Reviewed-on: https://chromium-review.googlesource.com/304521Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tryjob-Request: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>