Route selection bounds updates through WebLayerTreeView

Source/core/rendering/RenderObject.h

Index: Source/core/rendering/RenderObject.h
diff --git a/Source/core/rendering/RenderObject.h b/Source/core/rendering/RenderObject.h
index 1e5ffff8188e64d95ee9663a7eca03ebe0b85982..a7d32dc8d6d3a44aea38893e665a66994b18b772 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -781,6 +781,9 @@ public:
     FloatQuad localToContainerQuad(const FloatQuad&, const RenderLayerModelObject* paintInvalidatinoContainer, MapCoordinatesFlags = 0, bool* wasFixed = 0) const;
     FloatPoint localToContainerPoint(const FloatPoint&, const RenderLayerModelObject* paintInvalidationContainer, MapCoordinatesFlags = 0, bool* wasFixed = 0, const PaintInvalidationState* = 0) const;
 
+    // Convert a local point into the coordinate system of backing coordinates. Also returns the backing layer if needed.
+    FloatPoint localToInvalidationBackingPoint(const LayoutPoint&, RenderLayer** backingLayer = nullptr);
+
     // Return the offset from the container() renderer (excluding transforms). In multi-column layout,
     // different offsets apply at different points, so return the offset that applies to the given point.
     virtual LayoutSize offsetFromContainer(const RenderObject*, const LayoutPoint&, bool* offsetDependsOnPoint = 0) const;