does mesa support linux-explicit-synchronization-unstable-v1?

[zhuao]

Hi experts:
I noticed that weston merged some patches to support explicited GPU synchronization: 
https://bugs.freedesktop.org/show_bug.cgi?id=98766


when I tried to find corresponding feature in mesa, nothing is found.
is this feature test-able with recent weston/mesa?
thanks.






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