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messages -> DrawingAreaProxy NotRefCounted {
    EnterAcceleratedCompositingMode(uint64_t backingStoreStateID, WebKit::LayerTreeContext context)
    UpdateAcceleratedCompositingMode(uint64_t backingStoreStateID, WebKit::LayerTreeContext context)
    DispatchPresentationCallbacksAfterFlushingLayers(Vector<WebKit::CallbackID> callbackIDs);

#if PLATFORM(COCOA)
    // Used by TiledCoreAnimationDrawingAreaProxy.
    DidUpdateGeometry()
#endif

#if !PLATFORM(COCOA)
    Update(uint64_t stateID, WebKit::UpdateInfo updateInfo)
    DidUpdateBackingStoreState(uint64_t backingStoreStateID, WebKit::UpdateInfo updateInfo, WebKit::LayerTreeContext context)
    ExitAcceleratedCompositingMode(uint64_t backingStoreStateID, WebKit::UpdateInfo updateInfo)
#endif
}