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This CL is adding unittests for the Pause(...) and Resume(...) API.
Fix potential bugs while calling pause/resume multiple times. The
underlying platform implementations may not accept double pause or
double resume.

The related code pause/resume was not covered by previous unittests.

Bug: 1133813
Change-Id: I396bed4e2356a3b4bcb8363f0f82d005436022bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446190
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813430}