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Previously, this metrics didn't recorded when ServiceManager has been started.
Therefore, we miss the data for the cases that Chrome is launching when the
ServiceManager is running. This CL fix it by recording the metrics in a regular
browser startup callback.

Calling recordStartupUma() doesn't re-commit the metrics data if it has been
committed before.

Bug: 905678
Change-Id: If8a38aa81144084dd46d843a7fc9c1340445d3d0
Reviewed-on: https://chromium-review.googlesource.com/c/1480994
Commit-Queue: Xi Han <hanxi@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635540}