Clean up SkTLogic.

Clean up SkTLogic.

This change regularizes Skia's type traits so that when <type_traits>
can finally be used the transition is easier. Various traits are
renamed to match <type_traits> and placed in the skstd namespace.
Current users of these traits are updated.

Committed: https://skia.googlesource.com/skia/+/761cf6186e291ee8e4761e1280634cfe9c42eccc

[bungeman-skia, 2015-08-27 19:54:06]

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

[commit-bot: I haz the power, 2015-08-27 19:54:17]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1317593004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1317593004/1

[bungeman-skia, 2015-08-27 19:58:03]

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

[commit-bot: I haz the power, 2015-08-27 19:58:17]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1317593004/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1317593004/20001

[bungeman-skia, 2015-08-27 20:02:16]

bungeman@google.com changed reviewers:
+ bsalomon@google.com, mtklein@google.com

[mtklein, 2015-08-27 20:29:11]

lgtm

[bsalomon, 2015-08-27 23:03:47]

lgtm

[bungeman-skia, 2015-08-28 14:04:02]

The CQ bit was checked by bungeman@google.com

[commit-bot: I haz the power, 2015-08-28 14:04:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1317593004/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1317593004/40001

[commit-bot: I haz the power, 2015-08-28 14:09:25]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/761cf6186e291ee8e4761e1280634cfe9c42eccc