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Similarly to r568056 and 573161 this change adds skeletons required for
the implementation and testing of GATT Descriptor discovery on WinRT. No
functionality is added, this will follow in a future CL.

Bug: 821766
Change-Id: Ib6cb238c97899c94f54fcf5146a5e36ede69b909
Reviewed-on: https://chromium-review.googlesource.com/1155119Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579348}