Corrupted rendering after suspend on Linux.

[nical]

There have been several reports of rendering being corrupted when resuming from suspended state on linux. I believe there is a bugzilla entry for that but I haven't found yet.

gbs pointed out on irc that for nvidia with glx there is an extension which would be helpfull to address the issue: https://www.khronos.org/registry/OpenGL/extensions/NV/NV_robustness_video_memory_purge.txt

The best would probably be to add an api to clear all gpu-side caches and let gecko's render thread query the extension to detect gpu memory purges.

[kvark]

The WR API command ClearCaches is already there, just need to be called by Gecko on resume.

[gw3583]

Is there WR work to be done here or can this be closed?

[nical]

Let's wait until there is a Bugzilla entry for this before closing otherwise we'll lose the info. I'll try to remember to do that next time I'm in front of a computer.

[nical]

Filed https://bugzilla.mozilla.org/show_bug.cgi?id=1469496