We already use the power manager service to create a "screen" wake lock
to disable the screen saver in HTMLVideoElement::WakeLockUpdate(), but
the wake lock listener that actually disables the screen saver is only
implemented for B2G and I think Android, but not on other platforms.

I have a patch in Bug 968603 to implement a wake lock listener on
Windows, so we'll disable the screensaver on Windows during video
playback. To fix this on other platforms, we'll need to add wake lock
listeners for them too.

I suggest we use this bug to track when support for Mac, Linux, and
Windows (and Android if it hasn't already) have all landed.

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https://bugs.launchpad.net/bugs/434476

Title:
  screensaver starts while playing HTML5 videos

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