Testing Wanted: APZ Scrollbar dragging

Benoit Girard bgirard at mozilla.com
Wed Feb 17 18:35:02 UTC 2016


Currently APZ does not cause scrollbar initiated scrolling to be async.
I've been working in fixing this and I'd like some help testing it out
before enabling it on Nightly. If you're interested please flip
'apz.drag.enabled' to true and restart. If you find any issue please make
it block https://bugzilla.mozilla.org/show_bug.cgi?id=1211610.

I've got a test page here to confirm that it's turned on properly:
http://people.mozilla.org/~bgirard/scroll_no_paint.html

Scrolling on this page is slow in FF because it hits a performance bugs in
layer construction code. However with APZ the scrolling is smooth and a bit
checkerboard-y instead. If you have 'layers.acceleration.draw-fps' set you
should notice the left most FPS counter at 60 FPS while the middle counter
will be much lower. This is APZ handling the scroll.

Happy Testing,
Benoit


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