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This change adds class skeletons required for the implementation and
testing of GATT service discovery on WinRT. No functionality is added,
this CL is simply meant to reduce the size and boilerplate of the
following change.

Bug: 821766
Change-Id: Ie20629235f08dff9e5ffcb38273cc8ddb2a8e5e0
Reviewed-on: https://chromium-review.googlesource.com/1102023
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568056}