Move clip mask generation into GrReducedClip

Move clip mask generation into GrReducedClip

This is a temporary solution to facilitate window rectangles and make  
clip mask generation more accessible for testing. The eventual goal is 
to simplify clips and merge GrReducedClip into GrClipStackClip. 

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2263343002

Committed: https://skia.googlesource.com/skia/+/bde96c6263112de755a2573f6f5f02703386f328

[csmartdalton, 2016-08-22 17:36:15]

Description was changed from

==========
Remove clipToMaskOffset from GrClipStackClip helpers

Removes clipToMaskOffset from the GrClipStackClip helpers that
generate alpha masks. These methods already have the assumption that
the mask is for the area defined by reducedClip.ibounds(), so there
is no need for an externally defined offset.

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

to

==========
Remove clipToMaskOffset from GrClipStackClip helpers

Removes clipToMaskOffset from the GrClipStackClip helpers that
generate alpha masks. These methods already have the assumption that
the mask is for the area defined by reducedClip.ibounds(), so there
is no need for an externally defined offset.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2263343002
==========

[csmartdalton, 2016-08-22 17:38:29]

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

[bsalomon, 2016-08-22 17:55:53]

lgtm

[csmartdalton, 2016-08-22 18:05:43]

The CQ bit was checked by csmartdalton@google.com

[commit-bot: I haz the power, 2016-08-22 18:05:54]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-22 18:05:55]

This CL has an open dependency (Issue 2262473003 Patch 40001). Please resolve
the dependency and try again.
If you are sure that there is no real dependency, please use one of the options
listed in https://goo.gl/9Es4OR to land the CL.

[csmartdalton, 2016-08-31 03:33:12]

Description was changed from

==========
Remove clipToMaskOffset from GrClipStackClip helpers

Removes clipToMaskOffset from the GrClipStackClip helpers that
generate alpha masks. These methods already have the assumption that
the mask is for the area defined by reducedClip.ibounds(), so there
is no need for an externally defined offset.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2263343002
==========

to

==========
Move clip mask generation into GrReducedClip

This is a temporary solution to make clip mask generation more
accessible for testing. The eventual goal is to simplify clips and
merge GrReducedClip into GrClipStackClip.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2263343002
==========

[csmartdalton, 2016-08-31 03:35:11]

Description was changed from

==========
Move clip mask generation into GrReducedClip

This is a temporary solution to make clip mask generation more
accessible for testing. The eventual goal is to simplify clips and
merge GrReducedClip into GrClipStackClip.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2263343002
==========

to

==========
Move clip mask generation into GrReducedClip

This is a temporary solution to facilitate window rectangles and make  
clip mask generation more accessible for testing. The eventual goal is 
to simplify clips and merge GrReducedClip into GrClipStackClip. 

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2263343002
==========

[csmartdalton, 2016-08-31 03:47:20]

Still just a simple rearrangement of code that will be dying soon...

[bsalomon, 2016-08-31 17:44:25]

lgtm

[csmartdalton, 2016-08-31 19:38:06]

The CQ bit was checked by csmartdalton@google.com

[commit-bot: I haz the power, 2016-08-31 19:38:13]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-31 19:54:48]

Description was changed from

==========
Move clip mask generation into GrReducedClip

This is a temporary solution to facilitate window rectangles and make  
clip mask generation more accessible for testing. The eventual goal is 
to simplify clips and merge GrReducedClip into GrClipStackClip. 

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2263343002
==========

to

==========
Move clip mask generation into GrReducedClip

This is a temporary solution to facilitate window rectangles and make  
clip mask generation more accessible for testing. The eventual goal is 
to simplify clips and merge GrReducedClip into GrClipStackClip. 

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2263343002

Committed:
https://skia.googlesource.com/skia/+/bde96c6263112de755a2573f6f5f02703386f328
==========

[commit-bot: I haz the power, 2016-08-31 19:54:49]

Committed patchset #6 (id:100001) as
https://skia.googlesource.com/skia/+/bde96c6263112de755a2573f6f5f02703386f328