Move vertex layout definitions from GrDrawTarget to GrDrawState.

This is the first step in revising vertex layouts so that the currently
installed GrEffects determine the current vertex layout.

https://codereview.appspot.com/7235051/


git-svn-id: http://skia.googlecode.com/svn/trunk@7423 2bbb7eff-a529-9590-31e7-b0007b416f81
17 files changed