Bisect Mac performance regression.

With https://chromium.googlesource.com/skia/+/43b8b36b20ae00e2d78421c4cda1f3f922983a20 blink_perf.layout regressed. It appears that the typeface cache is being missed. This is a partial revert of the Skia change which reverts the smallest amount of code to restore performance.

BUG=chromium:425566
Committed: https://skia.googlesource.com/skia/+/47eda52e8fb88f0725b401762a3e0bddc98e9fb3

Committed: https://skia.googlesource.com/skia/+/336fdf2c5fad1cb0d7f51c16c2e13e7c75e0afd3

[bungeman-skia, 2014-11-04 17:07:28]

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

[bungeman-skia, 2014-11-04 17:08:07]

This should restore Mac performance until we can fix up the typeface cache.

[reed1, 2014-11-04 17:45:41]

lgtm

do we have a good understanding of the cache misses in general?

[bungeman-skia, 2014-11-04 18:19:38]

On 2014/11/04 17:45:41, reed1 wrote:
> lgtm
> 
> do we have a good understanding of the cache misses in general?

The issue appears to have something to do with when the new
fontstyle_from_descriptor is used by NewFromFontRef. It seems we're not getting
any hits that way. More broadly, the typeface cache needs some thought.

[bungeman-skia, 2014-11-04 18:19:43]

The CQ bit was checked by bungeman@google.com

[commit-bot: I haz the power, 2014-11-04 18:20:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/693213002/100001

[commit-bot: I haz the power, 2014-11-04 18:27:39]

Committed patchset #6 (id:100001) as 47eda52e8fb88f0725b401762a3e0bddc98e9fb3

[egdaniel, 2014-11-05 15:39:28]

A revert of this CL (patchset #6 id:100001) has been created in
https://codereview.chromium.org/683753003/ by egdaniel@google.com.

The reason for reverting is: Block deps roll by breaking webkit test
hit-test-counts on mac..

[bungeman-skia, 2014-11-10 15:47:44]

The CQ bit was checked by bungeman@google.com

[commit-bot: I haz the power, 2014-11-10 15:48:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/693213002/100001

[commit-bot: I haz the power, 2014-11-10 15:49:00]

Committed patchset #6 (id:100001) as
https://skia.googlesource.com/skia/+/336fdf2c5fad1cb0d7f51c16c2e13e7c75e0afd3