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We want to change activate so that rejecting the waitUntil promise
is the same as resolving it. Adding UMA to get an idea of the impact
of the change. It could be useful to have this data anyway, so also
adding it for Install.

BUG=480050

Review URL: https://codereview.chromium.org/1098953005

Cr-Commit-Position: refs/heads/master@{#326925}