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MB configs for the beta/stable trybots for PGO. Missed tryserver
definition.

Bug: 1081356,1085606
Change-Id: Ib17b5cab291ac9cbf8769c3622cb2793a60e584e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2214002
Auto-Submit: Jeff Yoon <jeffyoon@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771860}