Otherwise, the parent app cannot tell if the effective scale is != 1 during the initial pinch in. Plus, it makes more sense this way.
Created attachment 219366 [details] patch
Comment on attachment 219366 [details] patch View in context: https://bugs.webkit.org/attachment.cgi?id=219366&action=review > Source/WebKit2/UIProcess/mac/ViewGestureController.h:43 > + double magnification(); const?
http://trac.webkit.org/changeset/160675