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In anticipation of turning down nexus5x perf bot, we are
adding angle_perftests to the pixel2 bot.
Since pixel2 shard map seems rather unbalanced right now,
we also use this opportunity to reshard it.

Bug: 1030840
Change-Id: Ifdaa2c22560a11e0d389d003a39a06903ede2017
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1987071
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728320}