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This change introduces BluetoothAdapterWinrt, which will contain an
adapter implementation using Mirosoft UWP BLE APIs. This change merely
provides a skeleton, where each member function is NOTIMPLEMENTED().
Further functionality will be provided in future CLs.

Bug: 579202, 821766
Change-Id: I207e14de292f9d24b7d16710437e0dae839c82ec
Reviewed-on: https://chromium-review.googlesource.com/1046589
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556748}