This detects the last renderpass is actually rendering to the image we
are going to present and this is the very last renderpass to that image.
We use finalLayout of the renderpass to do layout transition to
VK_IMAGE_LAYOUT_PRESENT_SRC_KHR instead of a standalone barrier call.

Bug: b/153885625
Change-Id: Ifc17c77a1ba12f22c9d6038775f3e254c35655ca
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2155250
Commit-Queue: Charlie Lao <cclao@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>