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Refactors the remaining WMR wrappers that have mock implementations
(those in wmr_timestamp.h and wmr_rendering.h) in the same way as
https://crrev.com/c/1603748.

Bug: 961020
Change-Id: I0a28f981cf705c4950b660058712c9643546a784
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611422
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659656}