Fixes for blurroundrect gm/bench.

Fixes for blurroundrect gm/bench.

Simplify naming/various cases.
Have an atlas of gms, rather than several different images.
In the bench, pull non rendering out of the loop.
Use meaningful enums instead of integers where appropriate.
Add comments.

Addresses comments in https://codereview.chromium.org/52793005/

R=robertphillips@google.com

Committed: https://code.google.com/p/skia/source/detail?r=12144

[robertphillips, 2013-11-05 21:07:04]

lgtm + nit

https://codereview.chromium.org/59983004/diff/30001/bench/BlurRoundRectBench.cpp
File bench/BlurRoundRectBench.cpp (right):

https://codereview.chromium.org/59983004/diff/30001/bench/BlurRoundRectBench....
bench/BlurRoundRectBench.cpp:90: DEF_BENCH(return new BlurRoundRectBench(100,
100, 6);)
Fix comment

[scroggo, 2013-11-05 21:11:02]

Committed patchset #2 manually as r12144 (presubmit successful).