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This change provides an implementation of Windows::Foundation's
IReference interface. This class is supposed to be used for optional
POD types, as a null value usually is not possible here.

Bug: 821766
Change-Id: Icc6ff4f5313e2cfa13ca33f8d54e150efa616d76
Reviewed-on: https://chromium-review.googlesource.com/1106385Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568877}