This captures a bit more information about where the call time goes
during a flush. It can show at least on desktop NVIDIA that we spend a
fair amount of time in vkQueuePresentKHR.

Bug: angleproject:3117
Change-Id: I2d0195b9338bcac80e8dd8cfb550402271f286f9
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1650787
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>