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We'd like to know "is user watching video" vs "is user scrolling
around the page" when recording power.  So, we allow any
fullscreen-like experience to count, rather than just strictly
full-screening the media element.

While this is still not exact, it's much closer to what we want.

Bug: 1017787
Change-Id: Idb022eb10a9f5e51f0fdef58c3a11ab5e9f40849
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2070836Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745261}