Removing highp variables from perlin noise shader

Removing highp variables from perlin noise shader

Variables using highp on the Adreno320 (A.K.A. Nexus 4) seem to be causing issues. I modified the shader so that all variables stay in a lower range, no longer requiring the "highp" qualifier.
This may improve performance on other devices, like the xoom, where the "highp" qualifier was required.

In Blink, these layout tests may require rebaselining :
./css3/filters/effect-reference-hw.html
./css3/filters/effect-reference-zoom-hw.html

BUG=https://code.google.com/p/skia/issues/detail?id=1376

Committed: http://code.google.com/p/skia/source/detail?r=9903

[Stephen White, 2013-07-04 18:00:47]

On 2013/07/04 17:55:56, sugoi wrote:

LGTM. As discussed, please list the affected Blink layout tests as a heads-up to
the skia gardener.

[commit-bot: I haz the power, 2013-07-04 18:08:02]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/sugoi@chromium.org/18454004/1

[commit-bot: I haz the power, 2013-07-04 18:13:06]

Change committed as 9903