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 c6eb7af5c550811603d608d718e02af1a2d39dce..4d14fb517a48249d8299a9bb5a1ba1859e8aa169 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -53,6 +53,7 @@ class RenderObject;
 class RenderScrollbarPart;
 class RenderView;
 class RenderWidget;
+struct CompositedSelectionBound;
 
 typedef unsigned long long DOMTimeStamp;
 
@@ -393,6 +394,8 @@ private:
     void didScrollTimerFired(Timer<FrameView>*);
 
     void updateLayersAndCompositingAfterScrollIfNeeded();
+
+    static bool computeCompositedSelectionBounds(LocalFrame&, CompositedSelectionBound& start, CompositedSelectionBound& end);
     void updateCompositedSelectionBoundsIfNeeded();
 
     bool hasCustomScrollbars() const;