Vulkan: Implement EGL_KHR_partial_update This change provides a trivial implementation of partial update that does nothing, making apps that want this extension happy. A possible efficient Vulkan implementation would use the damage set to narrow down render area, but it appears to only be useful for only some TBDR hardware. Bug: angleproject:6960 Reviewed-by: Antonio Caggiano <antonio.caggiano@collabora.com> Change-Id: Ic553ac9590c336093f1bf25a6521574622599bf6 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3427640 Reviewed-by: Ian Elliott <ianelliott@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Auto-Submit: Constantine Shablya <constantine.shablya@collabora.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>