[Webkit-unassigned] [Bug 135244] New: Let WheelEvent wrap a PlatformWheelEvent

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=135244

           Summary: Let WheelEvent wrap a PlatformWheelEvent
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Unspecified
            Status: NEW
          Severity: Enhancement
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: wenson_hsieh at apple.com


If WheelEvent is initialized by a PlatformWheelEvent, store a reference to the PlatformWheelEvent. Subproblem of https://bugs.webkit.org/show_bug.cgi?id=135195 since ScrollAnimator::handleWheelEvent takes in a PlatformWheelEvent but the PlatformWheelEvent is discarded and rebuilt as a WheelEvent in Element::dispatchWheelEvent, we need a way of accessing the original PlatformWheelEvent in EventHandler. This will ultimately allow ScrollAnimator to know about momentum phases from the PlatformWheelEvent, which is necessary to implement scroll snapping (see https://bugs.webkit.org/show_bug.cgi?id=134283), among other things.

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