Vulkan: clearRegionWithScissor did not determine the region correctly When the scissor region given was completely outside the renderArea, we were calling vkCmdClearAttachments with the unmodified rectangle. Instead, we just need to actually skip the clear call since there is nothing to clear if we have a scissor region outside the render area. Bug: angleproject:2484 Change-Id: If2c7c5b91e07081f1d2e4f4d8d13f8c8a842ea0b Reviewed-on: https://chromium-review.googlesource.com/1014958 Commit-Queue: Luc Ferron <lucferron@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org>