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This CL adds some VLOG debug statements that help us identify problems in case
they arise during launch. They turned out to be useful while working on a finch
config. They won't replace debug data in chrome://password-manager-internals,
though. But that will be based on the serialization introduced here.

Bug: 846694
Change-Id: I20e8c1826cc8fa00860bfbeccaf832e93a0bb125
Reviewed-on: https://chromium-review.googlesource.com/1097086Reviewed-by: Vaclav Brozek <vabr@chromium.org>
Commit-Queue: Dominic Battré <battre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566547}