Video continues to play (with sound) when gallery is backgrounded

[sethladd]

When I play a video in the gallery, then hit the power button on my phone, the screen goes black but I continue to hear sound.

We probably want to stop playing video (and thus, stop the sound) when the app is backgrounded. If only to save power, but also to not play sound :)

[sethladd]

cc @mit-mit @sigurdm

[sigurdm]

This is happening now (since flutter/plugins#286)

[github-actions]

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