We now have gesture events. We should use them to control the zoom of the Timeline. We should keep scroll event to work with other input devices.
<rdar://problem/23473529>
If this lands before https://bugs.webkit.org/show_bug.cgi?id=149190, I'll incorporate gesture events into ScrollableView. Otherwise we can do it as a follow-up.
Err, I just put up a patch on a duplicate: <https://webkit.org/b/151071> Web Inspector: Support Gesture Events to zoom in / out of the Timeline *** This bug has been marked as a duplicate of bug 151071 ***