Metal: autogen for EXT_draw_buffers & ANGLE_framebuffer_blit Bug: angleproject:2634 Change-Id: I8f8ee91fb673301b8bd97c359ee39c411e2bf8da Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2336124 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>