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Metrics are added to measure different code paths in off-the-record
profile destruction, specifically when destruction is delayed due to
delayed RPHs.

Bug: 1033903
Change-Id: Ibc8c82c3f8c4d569c34e57aad1b508eff9eb32c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440625Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814111}