Speeup hairline curves (quads and cubics)

Speeup hairline curves (quads and cubics)

/skia/trunk> cat ../old.txt 
maxrss	loops	min	median	mean	max	stddev	samples   	config	bench
   9M	1	4.28ms	4.32ms	4.36ms	4.67ms	3%	▄▁▁▃▂▂▁▁▂█	8888	path_hairline_small_AA_cubic
   9M	1	743µs	767µs	770µs	825µs	4%	▃▃▇▃▁▁▅▁█▁	8888	path_hairline_small_AA_conic
   9M	1	533µs	606µs	598µs	680µs	9%	▁▂▂█▆▇▇▄▂▂	8888	path_hairline_small_AA_quad
   9M	1	451µs	452µs	456µs	495µs	3%	▁▁▁▁█▁▁▁▁▁	8888	path_hairline_small_AA_line

/skia/trunk> cat ../new.txt 
maxrss	loops	min	median	mean	max	stddev	samples   	config	bench
   9M	1	827µs	827µs	831µs	869µs	2%	▁▁▁▁▁▁▁█▁▁	8888	path_hairline_small_AA_cubic
   9M	1	515µs	517µs	517µs	518µs	0%	▇█▆▅▃▃▁▁▁▅	8888	path_hairline_small_AA_conic
   9M	1	310µs	311µs	315µs	332µs	2%	▂▁█▆▁▁▁▁▁▁	8888	path_hairline_small_AA_quad
   9M	1	254µs	254µs	258µs	276µs	3%	▁▁▁▁▁▁▁█▇▂	8888	path_hairline_small_AA_line

Edited revert of https://codereview.chromium.org/1085013003

TBR=

Expectations:
- no effect on chrome, as it is guarded
- lots of tiny rebaselines for skia

[reed1, 2015-04-15 19:27:39]

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

[commit-bot: I haz the power, 2015-04-15 19:27:51]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1078413003/80001

[commit-bot: I haz the power, 2015-04-15 19:34:18]

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

[commit-bot: I haz the power, 2015-04-15 19:34:19]

This issue passed the CQ dry run.

[reed1, 2015-04-15 20:03:14]

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

[commit-bot: I haz the power, 2015-04-15 20:03:23]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1078413003/120001

[commit-bot: I haz the power, 2015-04-15 20:09:29]

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

[commit-bot: I haz the power, 2015-04-15 20:09:30]

This issue passed the CQ dry run.

[reed1, 2015-04-15 20:13:17]

The CQ bit was checked by reed@google.com

[commit-bot: I haz the power, 2015-04-15 20:13:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1078413003/120001

[commit-bot: I haz the power, 2015-04-15 20:13:52]

Committed patchset #7 (id:120001) as
https://skia.googlesource.com/skia/+/a0246165eab9018d07afc09ff826ea4c40898ebc

[commit-bot: I haz the power, 2015-04-15 20:13:55]

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

[reed1, 2015-04-15 21:37:47]

A revert of this CL (patchset #7 id:120001) has been created in
https://codereview.chromium.org/1092483003/ by reed@google.com.

The reason for reverting is: Crazy failings in chrome tests
http://build.chromium.org/p/client.skia/builders/Linux%20Tests/builds/1862
.