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Some initialization steps may block (and trigger a crashing
check). Move it to a worker thread to unload the UI thread
and fix the crashing.

Waiting for the initialization to finish will be
implemented in the next CL.

Bug: 1145946
Change-Id: I03ca8aee5e0ab3870670506828b821a7a69bddff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2574938Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Michael Ershov <miersh@google.com>
Cr-Commit-Position: refs/heads/master@{#836058}