Even without the patch, simply adding:
PACKAGECONFIG_append_pn-mesa = "dri3"
to my conf/local.conf has glmark2-es2 running, and chromium-x11 is running
accelerated out-of-the-box (i.e. I don't have to install the egl/gles
libraries it builds itself).
I'm re-building my rpi3-64 image to see if things are better there too under
vc4.
I guess the patch is to address some of the other things you were seeing?
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