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Multi-threaded MOCK_TIME advances when either RunLoop::Run() or
ScopedTaskEnvironment::FastForward*() is active and the system reaches
an idle phase (both main thread and thread pool are out of immediate
tasks). It then advances by the minimum time delta necessary to make a
task able to run.

In a follow-up CL, I'll split MOCK_TIME off of MainThreadType (now that
it's no longer main thread specific) and migrate callers.

Bug: 946657
Change-Id: Id3da34ac066623291a8fca682fd13c9473e83e0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1686776Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676272}