Don't validate attribute types match for gl_VertexID and gl_InstanceID. TEST=conformance2/glsl3/no-attribute-vertex-shader TEST=deqp/functional/gles3/instancedrendering BUG=angleproject:2012 Change-Id: I234410fabf6a8fcd87040c8085ca5dce82fa8932 Reviewed-on: https://chromium-review.googlesource.com/559851 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org>