Vulkan: Swap RenderArea coords for pre-rotation Fixes Vulkan validation-layer errors. Found by dEQP tests that use small viewports and/or scissors (see Buganizer bugs for details). Bug: angleproject:4431 Bug: b/157933235 Bug: b/157933198 Change-Id: I83966906d70c30a4b50209cf1a33649bf69e3dd8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2225607 Commit-Queue: Ian Elliott <ianelliott@google.com> Reviewed-by: Cody Northrop <cnorthrop@google.com>