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Current ARC Bluetooth bridge assumes that setting of discoverable
timeout implies the adapter should go into discoverable mode.

This change tracks the discoverable timeout separately from the actual
transition to discoverable mode, and only puts the adapter into
discoverable mode when the scan mode is set to discoverable.

Bug: 945076
Test: OOBE flow on kevin
Change-Id: I5b154af261563bb4d241327c81bb9a819259dcce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1559992Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Josh Horwich <jhorwich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649262}