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This change adds request handlers for a future Settings UI to call into
in order to drive set/change PIN and reset operations.

Change-Id: I6df99d79807e4f87f20d4344a26eef7b896fd254
Reviewed-on: https://chromium-review.googlesource.com/c/1460412
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#632776}