[Webkit-unassigned] [Bug 105652] New: RenderLayerCompositor should let ScrollingCoordinator update main thread scrolling reasons after change of layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=105652

           Summary: RenderLayerCompositor should let ScrollingCoordinator
                    update main thread scrolling reasons after change of
                    layers
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: wangxianzhu at chromium.org


On Chromium ScrollingCoordinator will force main thread scrolling if there are any viewport-constrained objects not composited. However, sometimes (e.g. when the page is loading) the main thread scrolling reasons are not updated immediately after RLC promotes some fixed position elements to composited layers. This causes slow scrolling before the main thread scrolling reasons are correctly updated.

crbug.com/167312 describes the slow scrolling case.

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