[Webkit-unassigned] [Bug 143383] New: Minor cleanups to various scrolling classes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=143383

            Bug ID: 143383
           Summary: Minor cleanups to various scrolling classes
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

This is an initial set of changes that clean up a few things I noticed while extending testing support for scroll animations and wheel event gestures. (Bug 143286)
    1. Reduce the amount of #ifdef code in EventHandler{Mac}.
    2. Consolidate the idea of an "End Gesture" in the PlatformWheelEvent class.
    3. Remove a number of unneeded null checks in EventHandler.
    4. ScrollController must always have a client, so hold a reference instead of using a pointer.

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