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Currently we are hitting shard timeouts for angle_perftests on the
Android FYI 64 Perf (Pixel 2) bot. Even when we pass it's barely under the 20
minute shard time.

This adds a 4th shard for just that configuration.

TEST=angle_perftests

Bug: 1140626
Change-Id: Ib87d323a28e7c7703bc1af77246a89f2d8087413
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488044Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819152}