Support scroll up and down to zoom TimelineOverview.
Created attachment 219499 [details]
Created attachment 219546 [details]
Comment on attachment 219546 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=219546&action=review
> + var deviceDirection = event.webkitDirectionInvertedFromDevice ? -1 : 1;
Does this match Instruments / OS X Maps? As long as we are consistent with something in the system =).
*** Bug 14378 has been marked as a duplicate of this bug. ***