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Previously it was possible to have non-record shaders have a record,
which is invalid.  If these get written back out again, they are not
valid and will DCHECK.  We should just prevent these in the first place.

Bug: 868674
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I3da083024fcd47c4577b2a59c9a3014da2097e50
Reviewed-on: https://chromium-review.googlesource.com/1159113Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579960}