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b468ffa2b2
Use -Dawt.window.counters to enable.
To output counters per second to stdout/stderr,
use -Dawt.window.counters=stdout or =stderr.
A counter by the name swing.RepaintManager.updateWindows
is always available for Swing applications, but it does not
accurately correspond to frames per second.
Toolkit-dependent counters provide much better accuracy.
On Wayland with memory buffers as the backend two are available:
java2d.native.frames - frames delivered to the Wayland server
java2d.native.framesDropped - fully formed frames that were not
delivered to the Wayland server
(cherry picked from commit 639a7b4a5e)