Let SkCoverageDeltaList store width and use it during blitting

Otherwise, out/Debug/viewer -m complexclip_bw_invert may crash using
the threaded backend because the clip in the initFn may be wider
than the clip in the drawFn.

Bug: skia:
Change-Id: I3b3ddc9a912fcc155bd30a6bc1f87e24739d1ca6
Reviewed-on: https://skia-review.googlesource.com/121327
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
4 files changed