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 403aa55029bc50e2b53582f3f7ad3abde387319f..ecbb2da98cb12b855002c0cd9f074e837c0546a7 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;
 
@@ -384,6 +385,8 @@ private:
     void didScrollTimerFired(Timer<FrameView>*);
 
     void updateLayersAndCompositingAfterScrollIfNeeded();
+
+    static bool computeCompositedSelectionBounds(LocalFrame&, CompositedSelectionBound& start, CompositedSelectionBound& end);
     void updateCompositedSelectionBoundsIfNeeded();
 
     bool hasCustomScrollbars() const;