Fix UB function problems for AA merger.

Fix UB function problems for AA merger.

BUG=skia:4634
Committed: https://skia.googlesource.com/skia/+/9449616020a58043a49f0342679bf095918792a6

[herb_g, 2015-12-10 20:47:41]

herb@google.com changed reviewers:
+ mtklein@google.com

[herb_g, 2015-12-10 20:51:30]

clean up

[herb_g, 2015-12-10 20:52:52]

clean up

[herb_g, 2015-12-10 20:53:50]

Description was changed from

==========
Fix UB function problems for AA merger.

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

to

==========
Fix UB function problems for AA merger.

BUG=skia:4634
==========

[herb_g, 2015-12-10 20:53:59]

The CQ bit was checked by herb@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-12-10 20:54:08]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1518863002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1518863002/40001

[mtklein, 2015-12-10 20:59:41]

lgtm

[commit-bot: I haz the power, 2015-12-10 21:05:17]

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

[commit-bot: I haz the power, 2015-12-10 21:05:17]

Dry run: This issue passed the CQ dry run.

[herb_g, 2015-12-10 22:14:30]

The CQ bit was checked by herb@google.com

[commit-bot: I haz the power, 2015-12-10 22:14:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1518863002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1518863002/40001

[commit-bot: I haz the power, 2015-12-10 22:17:43]

Description was changed from

==========
Fix UB function problems for AA merger.

BUG=skia:4634
==========

to

==========
Fix UB function problems for AA merger.

BUG=skia:4634

Committed:
https://skia.googlesource.com/skia/+/9449616020a58043a49f0342679bf095918792a6
==========

[commit-bot: I haz the power, 2015-12-10 22:17:44]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/9449616020a58043a49f0342679bf095918792a6