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This metric was not previously recorded on Android because
startup_metric_utils::RecordStartupProcessCreationTime was never called.
We can use Process.getStartUptimeMillis() to get this value.

Bug: 1126301
Change-Id: Ic94be3635389c4a3c9b5e0f870b9d3290767a530
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402209
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806384}