Fix instances where hwaa was wrong for mixed samples

Fix instances where hwaa was wrong for mixed samples

Fixes a bug with coverage-AA hairlines where hwaa was unintentionally
enabled for mixed samples, and a bug with path stenciling where hwaa
was unintentionally disabled for mixed samples.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2043203004

Committed: https://skia.googlesource.com/skia/+/7942f22c607caf826a6a609b89338a569d0a30e7

[csmartdalton, 2016-06-08 01:56:37]

Description was changed from

==========
Fix instances where hwaa was wrong for mixed samples

Fixes a bug with coverage-AA hairlines where hwaa was unintentionally
enabled for mixed samples, and a bug with path stenciling where hwaa
was unintentionally disabled for mixed samples.

BUG=skia:
==========

to

==========
Fix instances where hwaa was wrong for mixed samples

Fixes a bug with coverage-AA hairlines where hwaa was unintentionally
enabled for mixed samples, and a bug with path stenciling where hwaa
was unintentionally disabled for mixed samples.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2043203004
==========

[csmartdalton, 2016-06-08 02:10:05]

csmartdalton@google.com changed reviewers:
+ bsalomon@google.com, robertphillips@google.com

[csmartdalton, 2016-06-08 02:10:06]

One more...

Robert, I have it in my mind that you're the one to throw pipelineBuilder
changes at. Hopefully I'm not blasting you with these unnecessarily :)

[bsalomon, 2016-06-08 13:26:35]

Rob is on vacation until 6/22. This lgtm.

[csmartdalton, 2016-06-08 16:18:55]

The CQ bit was checked by csmartdalton@google.com

[commit-bot: I haz the power, 2016-06-08 16:19:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2043203004/1

[commit-bot: I haz the power, 2016-06-08 16:32:56]

Description was changed from

==========
Fix instances where hwaa was wrong for mixed samples

Fixes a bug with coverage-AA hairlines where hwaa was unintentionally
enabled for mixed samples, and a bug with path stenciling where hwaa
was unintentionally disabled for mixed samples.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2043203004
==========

to

==========
Fix instances where hwaa was wrong for mixed samples

Fixes a bug with coverage-AA hairlines where hwaa was unintentionally
enabled for mixed samples, and a bug with path stenciling where hwaa
was unintentionally disabled for mixed samples.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2043203004

Committed:
https://skia.googlesource.com/skia/+/7942f22c607caf826a6a609b89338a569d0a30e7
==========

[commit-bot: I haz the power, 2016-06-08 16:32:57]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/7942f22c607caf826a6a609b89338a569d0a30e7