Adding unit tests for limited subset of DefaultPathRenderer

Adding unit tests for limited subset of DefaultPathRenderer

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/622d3aded25f7ddf220634546cc3da12bf30d5a6

[joshualitt, 2015-05-07 14:42:17]

joshualitt@google.com changed reviewers:
+ joshualitt@google.com, robertphillips@google.com

[joshualitt, 2015-05-07 14:42:18]

ptal

[robertphillips, 2015-05-07 14:51:51]

lgtm + a question

https://codereview.chromium.org/1129203002/diff/20001/src/gpu/GrDefaultPathRe...
File src/gpu/GrDefaultPathRenderer.cpp (right):

https://codereview.chromium.org/1129203002/diff/20001/src/gpu/GrDefaultPathRe...
src/gpu/GrDefaultPathRenderer.cpp:775: 
Do we need to randomize coverage too?

[joshualitt, 2015-05-07 15:07:14]

The CQ bit was checked by joshualitt@google.com

[joshualitt, 2015-05-07 15:07:15]

The patchset sent to the CQ was uploaded after l-g-t-m from
robertphillips@google.com
Link to the patchset: https://codereview.chromium.org/1129203002/#ps40001
(title: "more tidying")

[commit-bot: I haz the power, 2015-05-07 15:07:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1129203002/40001

[commit-bot: I haz the power, 2015-05-07 15:13:16]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/622d3aded25f7ddf220634546cc3da12bf30d5a6