Properly validate struct uniform linking between the vertex and pixel shaders. This also implements proper struct validation for uniform blocks. TRAC #22932 Signed-off-by: Nicolas Capens Signed-off-by: Geoff Lang Author: Jamie Madill git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2336 736b8ea6-26fd-11df-bfd4-992fa37f6226