Revert of No threadsafe statics.

Revert of No threadsafe statics. (patchset #1 id:1 of https://codereview.chromium.org/654663002/)

Reason for revert:
Want to think about how to do this only to skialib and not to tools (gms, tests, etc.)

Original issue's description:
> No threadsafe statics.
> 
> Chrome disables these for speed and code size, so we need
> to disable them to make sure our code is safe when used
> this way.
> 
>     int foo() {
>         static int32_t atomic_thing;
>         return sk_atomic_inc(&atomic_thing);
>     }
> 
> is not safe in Chrome.  Making the static global is:
> 
>     static int32_t atomic_thing;
>     int foo() {
>         return sk_atomic_inc(&atomic_thing);
>     }
> 
> BUG=skia:
> 
> Committed: https://skia.googlesource.com/skia/+/cad5d3e264535c919b80e1e2a85407307961f221

TBR=bungeman@google.com,mtklein@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/380d7d733953081b476fa04bf9e0093b85d0b1c4

[mtklein, 2014-10-13 21:49:34]

Created Revert of No threadsafe statics.

[commit-bot: I haz the power, 2014-10-13 21:50:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/649343003/1

[commit-bot: I haz the power, 2014-10-13 21:50:46]

Committed patchset #1 (id:1) as 380d7d733953081b476fa04bf9e0093b85d0b1c4