[Webkit-unassigned] [Bug 193754] New: Allow scrolling tree nodes to exist in a detached state

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193754

            Bug ID: 193754
           Summary: Allow scrolling tree nodes to exist in a detached
                    state
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

To avoid tricky ordering dependencies between compositing/scrolling tree updates in child and parent frames, we need to make it possible to create ScrollingStateNodes in a detached state (basically calling ScrollingCoordinator::attachToStateTree() with no parent node). This will allow subframes to have a detached subtree of scrolling nodes, then attach this subtree when the iframe layers are hooked up by RenderLayerCompositor.

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