Add wide color support to stroke rect op and default GP

Bug: skia:
Change-Id: Ie75985b9fd66352590901f78697f56554128b7d6
Reviewed-on: https://skia-review.googlesource.com/c/177620
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
3 files changed