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This CL introduces the GattServicesWorkaround class with an
implementation and test double. The class is initialized as part of the
asynchronous shutdown flow and is invoked by BleConnectionManager when
GATT services are unavailable.

Bug: 784968, 672263
Change-Id: If81085bf9f8c7ac7f6715f93f9c3c07a8dbc13e2
Reviewed-on: https://chromium-review.googlesource.com/777983Reviewed-by: Jeremy Klein <jlklein@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519516}