GitLab

Add FakeDeviceCapabilityManager, DeviceCapabilityManagerImpl,
and a factory for DeviceCapabilityManager.

Make DeviceCapabilityManager a pure virtual base class.

Bug: 752273
Change-Id: Ibf29b3a2cf893c2144315134e751884460ea3cd7
Reviewed-on: https://chromium-review.googlesource.com/671196
Commit-Queue: Regan Hsu <hsuregan@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#503650}