Jeff Muizelaar 169ebd334c Bug 623446. Turn the layer acceleration prefs into a tri-state. r=joe,a=b
This removes:
 layers.accelerate-all
 layers.accelerate-none

and adds:
 layers.acceleration.disabled
 layers.acceleration.force-enabled

This is closer to what D2D does.
2011-01-11 17:01:37 -05:00
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