[OpenVG] Implement more graphics primitives
Created attachment 47726 [details] Patch
This patch should be pretty straightforward, and does exactly what the title says. I'm also cleaning up some unnecessary indirections in GraphicsContextOpenVG's rectangle wrapper code, which don't make a lot of sense since (after the last patch has been changed from its original version) m_data is now the painter itself, instead of a wrapper class that holds the painter. Please review, thanks!
Comment on attachment 47726 [details] Patch LGTM, r=me.
Committed r54089: <http://trac.webkit.org/changeset/54089>