Revert of Revert of added stroking support to GrAALinearizingConvexPathRenderer ...

Revert of Revert of added stroking support to GrAALinearizingConvexPathRenderer (patchset #1 id:1 of https://codereview.chromium.org/1212833002/)

Reason for revert:
Manual roll is in: https://codereview.chromium.org/1212373002

Let's re-land this.

Original issue's description:
> Revert of added stroking support to GrAALinearizingConvexPathRenderer (patchset #6 id:100001 of https://codereview.chromium.org/1180903006/)
>
> Reason for revert:
> speculative revert to try to fix DEPS roll (layouttests)
>
> Original issue's description:
> > added stroking support to GrAALinearizingConvexPathRenderer
> >
> > BUG=skia:
> >
> > Committed: https://skia.googlesource.com/skia/+/2436f191e6602953b32a51cf50f2d7a4e2af90fd
>
> TBR=bsalomon@google.com,robertphillips@google.com,ethannicholas@google.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/9730f4a663534009d216c2f6d834bd534dd44a3d

TBR=bsalomon@google.com,robertphillips@google.com,ethannicholas@google.com,reed@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1209003004