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This change implements pairing on WinRT and adds appropriate tests. In order
to encapsulate the implementation, a new BluetoothPairingWinrt helper class
is introduced. For now only pairing via PIN code is supported.

Bug: 821766
Change-Id: Ic0a64b4e79dd38f9c0ac86a25c0a878f1f70192c
Reviewed-on: https://chromium-review.googlesource.com/1177741
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584391}