Fix android build issues with atomics

Fix android build issues with atomics

Uses inline methods for sk_atomic_inc/add/dec instead of #define.
Since those methods are declared as static in SkThread.h, they need
a definition or else the compiler generates an error. Also corrects
a typo.

BUG=skia:

Committed: http://code.google.com/p/skia/source/detail?r=13360

[bsalomon, 2014-01-31 21:57:11]

Changing reviewers to Derek and Ben.

[bungeman-skia, 2014-02-03 15:42:15]

This LGTM, and I like having the static inlines instead of the preprocessor
defines anyway. (And where did that extra '_' come from anyhow?)

[djsollen, 2014-02-03 16:38:08]

lgtm

[Chris Dalton, 2014-02-07 02:30:06]

On 2014/02/03 16:38:08, djsollen wrote:
> lgtm

Hey guys, has this landed?

[bsalomon, 2014-02-07 13:42:03]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2014-02-07 13:42:06]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/cdalton@nvidia.com/148113010/1

[bsalomon, 2014-02-07 13:42:38]

On 2014/02/07 02:30:06, Chris Dalton wrote:
> On 2014/02/03 16:38:08, djsollen wrote:
> > lgtm
> 
> Hey guys, has this landed?

I just clicked the CQ button. Do you not have access to using the CQ?

[commit-bot: I haz the power, 2014-02-07 13:55:59]

Change committed as 13360