Perform perlin noise matrix computations once per frame, not per pixel.

Perform perlin noise matrix computations once per frame, not per pixel.

Before (Retina MBP):
running bench [640 480]                              perlinnoise   8888:  cmsecs =   1853.18

After:
running bench [640 480]                              perlinnoise   8888:  cmsecs =   1667.06

Committed: https://code.google.com/p/skia/source/detail?r=14060

[Stephen White, 2014-04-04 14:09:05]

sugoi@: PTAL. Thanks!

[sugoi, 2014-04-04 14:21:06]

On 2014/04/04 14:09:05, Stephen White wrote:
> sugoi@: PTAL. Thanks!

LGTM

[Stephen White, 2014-04-04 14:41:08]

The CQ bit was checked by senorblanco@chromium.org

[commit-bot: I haz the power, 2014-04-04 14:41:12]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/senorblanco@chromium.org/225583006/20001

[commit-bot: I haz the power, 2014-04-04 14:41:13]

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

[commit-bot: I haz the power, 2014-04-04 14:41:13]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a lowly provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Stephen White, 2014-04-04 14:46:38]

Committed patchset #2 manually as r14060 (presubmit successful).