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If the page is being invisible, we now defer media playback in the
background. I've moved this logic to a shared location so Chrome and
WebLayer can reuse it and stay in sync.

Bug: 1096088
Change-Id: I61465da4717d28ff8e9f6f83fd2a75fe79fc44ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352819
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798072}