While in ESSL 3.00 invariant is allowed only for out varyings.
Verify that, and update test expectations.
BUG=angleproject:1293
TEST=GLSLTest*.Invariant*
Change-Id: I5cab6c68f2b94ea2179719119668d905fe7a9b3d
Reviewed-on: https://chromium-review.googlesource.com/352743Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
