Distance field fixes for Android
- Expand glyph size by 2 on each side to compensate for bilerp lookup
- Correct for Adreno tendency to drop entire tile if any pixel has divide-by-0
- Fix blurriness on Adreno by using uv coords to compute gradient instead
of st coords
- Add faster version for uniform scale
BUG=skia:2173
Committed: http://code.google.com/p/skia/source/detail?r=13955
R=bsalomon@google.com
Author: jvanverth@google.com
Review URL: https://codereview.chromium.org/
205343008
git-svn-id: http://skia.googlecode.com/svn/trunk@13958
2bbb7eff-a529-9590-31e7-
b0007b416f81