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Also separates out GLES 1 tests into its own definition.

Bug: angleproject:5124
Change-Id: Id0936d7b5e835ac48f621df2ac0620b40e3e70a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469518Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816867}