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Callback for BluetoothAdapterFactory::GetAdapter() may be invoked
synchronously for ChromeOS devices. This results in discovery of
FidoBleDevices that were already known to BluetoothAdapter not being
notified to UI embedder, and WebAuthN UI would not show new Bluetooth
devices on device selection view --even when FidoBleDevices are
discovered. To avoid such hairpinning, invoke
FidoDeviceDiscovery::StartInternal asynchronously.

Bug: 823686
Change-Id: Idc6c4d1d12d76a15118f15366e734325ba1819c0
Reviewed-on: https://chromium-review.googlesource.com/c/1300798
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603216}