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Adding PGO trybot GN arguments to mb_config.pyl

Change-Id: I00cbb3c8165792858fc5f60f39723528ca71361f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552883Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Jeff Yoon <jeffyoon@google.com>
Cr-Commit-Position: refs/heads/master@{#833623}