Move texture domains onto a GrCustomStage, off of GrSamplerState.

This will require gyp changes to roll into Chrome.

http://codereview.appspot.com/6405050/



git-svn-id: http://skia.googlecode.com/svn/trunk@4641 2bbb7eff-a529-9590-31e7-b0007b416f81
8 files changed