Add kwargs to specialized error message https://crrev.com/c/4505697 started accepting show_callstack. Since Msg is used as specialized error message, it also needs to accept show_callstack since CallCommand will pass it. Bug: chromium:1451607 Change-Id: Ib3aee58b41d2419446e71b8e67392daed407714d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4591539 Commit-Queue: Brian Sheedy <bsheedy@chromium.org> Auto-Submit: Josip Sokcevic <sokcevic@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org>