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The pool has plenty of 4-cores for extra builds: http://shortn/_yG5NjPy3mD
And 100 more 4-cores are added to the pool in crrev.com/i/3308210

Bug: 997376, 1127110
Change-Id: I377f3192f5da13f59c1d057f28b2b97ab3f08dbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446511Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#813277}