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Init is potentially heavy call which is run on the UI thread
during dynamic module loading. Add UMA to measure its execution time.

Change-Id: I09d98f8efcc7183d04846dc694516e2eeb35154f
Reviewed-on: https://chromium-review.googlesource.com/c/1291310
Commit-Queue: Anna Malova <amalova@chromium.org>
Reviewed-by: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
Reviewed-by: Robert Kaplow (sloooow) <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601585}