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Also updating what tests run on each shard to help debug the failing tests.

Bug: 758632
Change-Id: Ib0eb60f0b9ae7e3a2cd19ae8c1f8183d4d0b7d81
Reviewed-on: https://chromium-review.googlesource.com/955676Reviewed-by: Ashley Enstad <ashleymarie@chromium.org>
Commit-Queue: Ashley Enstad <ashleymarie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542060}