[Webkit-unassigned] [Bug 101001] New: Pages with position:fixed elements should still be able to scroll on the scrolling thread

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=101001

           Summary: Pages with position:fixed elements should still be
                    able to scroll on the scrolling thread
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bdakin at apple.com


Currently when we have position:fixed elements on a page we fall into the slow "scroll on the main thread" mode. 

The scrolling tree should know about fixed layers so we can do scrolling on the scrolling thread.

<rdar://problem/10857315>

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