Expose public interface for composited selection bounds

Source/core/page/ChromeClient.h

Index: Source/core/page/ChromeClient.h
diff --git a/Source/core/page/ChromeClient.h b/Source/core/page/ChromeClient.h
index 7ddcd06bb8961cfd837e50146e63277b37837b1b..b30703bfe259d0220a576594160c12a9e427b599 100644
--- a/Source/core/page/ChromeClient.h
+++ b/Source/core/page/ChromeClient.h
@@ -73,6 +73,7 @@ class PopupMenuClient;
 class SecurityOrigin;
 class Widget;
 
+struct CompositedSelectionBound;
 struct DateTimeChooserParameters;
 struct FrameLoadRequest;
 struct GraphicsDeviceAdapter;
@@ -193,6 +194,9 @@ public:
     virtual void enterFullScreenForElement(Element*) { }
     virtual void exitFullScreenForElement(Element*) { }
 
+    virtual void clearCompositedSelectionBounds() { }
+    virtual void updateCompositedSelectionBounds(const CompositedSelectionBound& anchor, const CompositedSelectionBound& focus) { }
+
     virtual void needTouchEvents(bool) = 0;
 
     virtual void setTouchAction(TouchAction) = 0;