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The new oncall is sourced from the internal go/rotations tool.

Bug: chromium:1138008
Bug: angleproject:4730
Change-Id: Ide6b3119f86ec65e1298fd64597e9a91fced03c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469716Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816964}