Set max vertex correctly when drawing closing line We were setting the max vertex way too low, causing AMD cards to draw the line with an incorrect vertex. BUG= TEST=enable "Composited render layer borders" in chromium Review URL: http://codereview.appspot.com/4588042 git-svn-id: https://angleproject.googlecode.com/svn/trunk@691 736b8ea6-26fd-11df-bfd4-992fa37f6226