FrameTimeDiagnosticsPlugin should track real frame time when vsync is enabled #3768

What problem does this solve or what need does it fill?

I'd like to know how close I am to my budget by looking at the frame time.

What solution would you like?

When vsync is enabled, the frame time should not include the time spent waiting to draw the next frame.

What alternative(s) have you considered?

Disable vsync to get my actual frame times.