Fix the bug that long varying varibales are mapped into different names in fragment/vertex shaders. ANGLEBUG=144 TEST=the same long varying variable name in fragment/vertex shaders map to the same shortened name if using the same translator. Review URL: http://codereview.appspot.com/4547063 git-svn-id: https://angleproject.googlecode.com/svn/trunk@660 736b8ea6-26fd-11df-bfd4-992fa37f6226