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Most of test suites will be run in MM-x86-rel-non-cq
MM-x86-rel will run only chrome_public_test_apk since it fails very often.
And have it run on 4-cores to evaluate capacity

Bug: 997376, 1127110
Change-Id: I57cd561600a28fcf21e440b167729a02ccd13909
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2415141
Commit-Queue: Haiyang Pan <hypan@google.com>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808429}