Route selection bounds updates through WebLayerTreeView

Source/core/frame/FrameView.h

Index: Source/core/frame/FrameView.h
diff --git a/Source/core/frame/FrameView.h b/Source/core/frame/FrameView.h
index d77e627d05dbcc9b16705b2a5620bbc95849d59f..f3b0db5bcda68f9d406c3d608faa52f8dde14217 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -54,6 +54,7 @@ class RenderScrollbarPart;
 class RenderStyle;
 class RenderView;
 class RenderWidget;
+struct CompositedSelectionBound;
 
 typedef unsigned long long DOMTimeStamp;
 
@@ -388,6 +389,8 @@ private:
     void didScrollTimerFired(Timer<FrameView>*);
 
     void updateLayersAndCompositingAfterScrollIfNeeded();
+
+    static bool computeCompositedSelectionBounds(LocalFrame&, CompositedSelectionBound& start, CompositedSelectionBound& end);
     void updateCompositedSelectionBoundsIfNeeded();
 
     bool hasCustomScrollbars() const;