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Firebase is only used to record the `first_open` event, so there
is no need to start it if the event was recorded in a previous
execution of the app.

Add a new value to the metrics used to record the state of the
Firebase initialisation.

Bug: 1148441
Change-Id: I3e2bb50f3d2d4458e53e4dc0464e0e19a5504e55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2534895
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826946}