faster edge re-sort, drop trailing edges

faster edge re-sort, drop trailing edges

1. drop edges that are wholly on the right (in the non-convex walker)
2. scan and swap once, instead of swapping as we go during re-sort

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/38f1c00772539dcbeccbfa3c45d94bdc4acf3518

[reed1, 2015-02-06 22:03:28]

The CQ bit was checked by reed@google.com

[commit-bot: I haz the power, 2015-02-06 22:04:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/891613003/40001

[commit-bot: I haz the power, 2015-02-06 22:04:04]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-02-07 04:04 UTC

[reed1, 2015-02-06 22:04:19]

The CQ bit was unchecked by reed@google.com

[reed1, 2015-02-06 22:04:31]

reed@google.com changed reviewers:
+ caryclark@google.com

[caryclark, 2015-02-06 22:06:40]

lgtm

[reed1, 2015-02-06 22:11:57]

New patchsets have been uploaded after l-g-t-m from caryclark@google.com

[reed1, 2015-02-06 22:12:21]

The CQ bit was checked by reed@google.com

[commit-bot: I haz the power, 2015-02-06 22:13:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/891613003/60001

[commit-bot: I haz the power, 2015-02-06 22:18:52]

Committed patchset #4 (id:60001) as
https://skia.googlesource.com/skia/+/38f1c00772539dcbeccbfa3c45d94bdc4acf3518

[reed2, 2015-02-07 02:06:59]

A revert of this CL (patchset #4 id:60001) has been created in
https://codereview.chromium.org/910493002/ by reed@chromium.org.

The reason for reverting is: may be breaking layouttests....