Provide better encapsulation for Shader member variables Trac 19900 Issue=291 Moved a bunch of member variables from 'protected' to 'private' Signed-off-by: Shannon Woods Signed-off-by: Nicolas Capens git-svn-id: https://angleproject.googlecode.com/svn/trunk@989 736b8ea6-26fd-11df-bfd4-992fa37f6226