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This is a reland of 6bcf1a99

Original change's description:
> Re-enable `chromium.resultdb.result_sink` experiment on chromium fyi builders at 30%
>
> Bug: 1108016
> Change-Id: I90beaf78f9f4b8508f6229b17b07a44943f442d6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462049
> Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
> Commit-Queue: Chan Li <chanli@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#815450}

Bug: 1108016
Change-Id: I257a1f13a7cefe4c95e0a93d9ba87b57b19c716f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463102
Auto-Submit: Chan Li <chanli@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Chan Li <chanli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815483}