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Using the metrics added in earlier to track information about the
start-up flow for borealis.

Cq-Depend: 2509072
Bug: b/171339461
Change-Id: If0e0f3c212ab1ff4cfddf43b10104f453a99e0e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517347
Commit-Queue: Daniel Ng <danielng@google.com>
Reviewed-by: Nic Hollingum <hollingum@google.com>
Cr-Commit-Position: refs/heads/master@{#825740}