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:

Committed: https://skia.googlesource.com/skia/+/bd5d7e75c1ef08816bfd8eed52150cd716e15d5b

[f(malita), 2015-06-26 14:18:13]

Created Revert of Revert of added stroking support to
GrAALinearizingConvexPathRenderer

[commit-bot: I haz the power, 2015-06-26 14:18:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1209003004/1

[commit-bot: I haz the power, 2015-06-26 14:18:28]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/bd5d7e75c1ef08816bfd8eed52150cd716e15d5b