Draft: Render timing measurements

Closed Andri Yngvason requested to merge andri/wlroots:render-timing-measurements into master

This adds render timing measurements to the GLES2 renderer so that we can know how long it takes to render frames on the GPU.

PR for sway can be found here: https://github.com/swaywm/sway/pull/7184

Edited by Andri Yngvason

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