[Webkit-unassigned] [Bug 66901] New: Enable RenderLayer::updateLayerPosition's cachedOffset optimization for more cases

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=66901

           Summary: Enable RenderLayer::updateLayerPosition's cachedOffset
                    optimization for more cases
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jchaffraix at webkit.org
                CC: hyatt at apple.com, simon.fraser at apple.com,
                    jamesr at chromium.org


Currently cachedOffset is only setup when doing a layout of the whole tree (see FrameView::layout()). However RenderLayer::updateLayerPositions has multiple call sites which could benefit from the optimization. Among them is a layout of a subtree inside FrameView::layout.

This is a trade-off as not hitting the cache later means that we have wasted a traversal to the root of the tree. However discussing this with James, it seems OK to go this route and on average should be at least a wash.

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