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Since scheduler/base is getting moved to //base/task/sequence_manager
we don't want to explicitly support the concept of virtual time
because it might be confused with the existing mechanism to override
a TickClock in //base. So we can't move VirtualTimeDomain to //base.
It was used in some tests in scheduler/base as a mock time domain,
so this CL makes it explicit and test-only.

Bug: 783309
Change-Id: I0a11e565de94fce06af4aff288427b6bc78e890b
Reviewed-on: https://chromium-review.googlesource.com/1120257Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Greg Kraynov <kraynov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571562}