Added an option for specifying language specification in preparation for supporting WebGL in addition to GLES2. This CL just replaces unused debugOptions variable with EShSpec variable.
BUG=11
Review URL: http://codereview.appspot.com/1692051

git-svn-id: https://angleproject.googlecode.com/svn/trunk@344 736b8ea6-26fd-11df-bfd4-992fa37f6226