Add modulo flag to lua_pictures.

Add modulo flag to lua_pictures.
The intended use is spawning processes to save time.

Committed: http://code.google.com/p/skia/source/detail?r=9736

[sglez, 2013-06-21 18:55:34]

This is a small CL to add a modulo flag to lua_pictures

[reed1, 2013-06-21 19:01:16]

lgtm

[commit-bot: I haz the power, 2013-06-21 19:08:36]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/sglez@google.com/16950025/1

[commit-bot: I haz the power, 2013-06-21 21:45:22]

Change committed as 9736