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Several Picture-in-Picture browser tests require video playback to have
started, but they didn't really enforce it considering that the `play()`
method of the media element is asynchronous. In particular, a test
verifying the visibility of a control bound to a MediaSession action
might never see the control: The control is visible when the video is
actually playing and also it's hidden automatically 2.5 s after the
start of mouse hover. If playback doesn't start during those 2.5 seconds
(which is plausible if the test machines are under heavy load) the
hiding timeout will elapse first.

Bug: 985303
Change-Id: I7f9d62e8496cb5419445dd27c94fde91d541a6ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2635156Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Wojciech Dzierżanowski <wdzierzanowski@opera.com>
Cr-Commit-Position: refs/heads/master@{#845409}