Add nv_path_rendering entry points to Unix GLInterface

Add nv_path_rendering entry points to Unix GLInterface.
Also add few other GL entry points that are used by nv_path_rendering
codepaths.

BUG=1468
R=bsalomon@google.com

Author: kkinnunen@nvidia.com

Review URL: https://chromiumcodereview.appspot.com/21808003

git-svn-id: http://skia.googlecode.com/svn/trunk@10512 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed