Plumb selection bounds as a single unit

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 2a14ea1cf17d637c0985c644c85978492b9ac128..1c355e7296502b8d3637fd898a438944a16745ef 100644
--- a/Source/core/page/ChromeClient.h
+++ b/Source/core/page/ChromeClient.h
@@ -62,7 +62,7 @@ class Page;
 class PagePopupDriver;
 class PopupMenuClient;
 
-struct CompositedSelectionBound;
+struct CompositedSelection;
 struct DateTimeChooserParameters;
 struct FrameLoadRequest;
 struct GraphicsDeviceAdapter;
@@ -183,8 +183,8 @@ public:
     virtual void enterFullScreenForElement(Element*) { }
     virtual void exitFullScreenForElement(Element*) { }
 
-    virtual void clearCompositedSelectionBounds() { }
-    virtual void updateCompositedSelectionBounds(const CompositedSelectionBound& anchor, const CompositedSelectionBound& focus) { }
+    virtual void clearCompositedSelection() { }
+    virtual void updateCompositedSelection(const CompositedSelection&) { }
 
     virtual void needTouchEvents(bool) = 0;