Methods receive VkDevice instead of Context
and return VkResult instead of angle::Result now.

Bug: angleproject:2657
Change-Id: I3eca8692ad0b3b6e96e31fd433ed14e04384990e
Reviewed-on: https://chromium-review.googlesource.com/c/1330105Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>