We want the screensaver to disable during <video> playback, and WebRTC calls too. It's pretty simple to achieve this, we need to add a nsIDOMMozWakeLockListener which disables the screen saver on "locked-foreground" state, and re-enables it otherwise. For example, this is done for Metrofox already, using a WinRT API: http://mxr.mozilla.org/mozilla-central/source/widget/windows/winrt/MetroAppShell.cpp#54 This bug covers Windows desktop implementation, we'll need something similar for other platforms. There is discussion in bug 517870 as to what APIs to use on other platforms to implement this.

Add a wake lock listener in Win32's appshell to disable the screen saver when Gecko wants to. So we can disable the screen saver during video playback on Windows.

Comment on attachment 8371200 [details] [diff] [review] Patch Review of attachment 8371200 [details] [diff] [review]: ----------------------------------------------------------------- I bet this would work on both platforms.

Fixed a compile error discovered on Try. Patch ready for landing. Re-trying: https://tbpl.mozilla.org/?tree=Try&rev=eed2741433c6