Use Vulkan rectangle lines to emulate OpenGL multisampled lines SwiftShader recently added support for multisampled Bresenham lines to be spec compliant with Vulkan, so now Angle must explicitly request non-Bresenham lines when multisampling is enabled. Bug: angleproject:4087 Change-Id: Ie854746144894e3e0a68622e985cbd4ba7781ac3 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1944529 Commit-Queue: Antonio Maiorano <amaiorano@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>