Make first-letter style to work with editing

Source/core/editing/Caret.h

Index: Source/core/editing/Caret.h
diff --git a/Source/core/editing/Caret.h b/Source/core/editing/Caret.h
index 5e2c61c0c3dcdce294bd2de7af234004559ef3a7..4f016322afea43a9092ad85663bdb174d8a306e6 100644
--- a/Source/core/editing/Caret.h
+++ b/Source/core/editing/Caret.h
@@ -45,12 +45,12 @@ protected:
     enum CaretVisibility { Visible, Hidden };
     explicit CaretBase(CaretVisibility = Hidden);
 
-    void invalidateCaretRect(Node*, bool caretRectChanged = false);
+    void invalidateCaretRect(const Position&, bool caretRectChanged = false);
     void clearCaretRect();
     bool updateCaretRect(Document*, const VisiblePosition& caretPosition);
-    IntRect absoluteBoundsForLocalRect(Node*, const LayoutRect&) const;
+    IntRect absoluteBoundsForLocalRect(const Position&, const LayoutRect&) const;
     bool shouldRepaintCaret(const RenderView*, bool isContentEditable) const;
-    void paintCaret(Node*, GraphicsContext*, const LayoutPoint&, const LayoutRect& clipRect) const;
+    void paintCaret(const Position&, GraphicsContext*, const LayoutPoint&, const LayoutRect& clipRect) const;
 
     const LayoutRect& localCaretRectWithoutUpdate() const { return m_caretLocalRect; }
 
@@ -62,8 +62,9 @@ protected:
     CaretVisibility caretVisibility() const { return m_caretVisibility; }
 
 protected:
-    static RenderObject* caretRenderer(Node*);
-    static void repaintCaretForLocalRect(Node*, const LayoutRect&);
+    static RenderObject* caretRenderer(RenderObject*);
+    static RenderObject* caretRenderer(const Position&);
+    static void repaintCaretForLocalRect(const Position&, const LayoutRect&);
 
 private:
     LayoutRect m_caretLocalRect; // caret rect in coords local to the renderer responsible for painting the caret