Make first-letter style to work with editing

Source/core/dom/Position.h

Index: Source/core/dom/Position.h
diff --git a/Source/core/dom/Position.h b/Source/core/dom/Position.h
index d2b1d1e552fa20b0ee464fa32e2dde7ba10a95a4..2c04aabd65bd6beead69854fafdcec06a1561891 100644
--- a/Source/core/dom/Position.h
+++ b/Source/core/dom/Position.h
@@ -122,6 +122,13 @@ public:
 
     Node* anchorNode() const { return m_anchorNode.get(); }
 
+    // FIXME: We should replace anchorNode()->renderer() and deprecatedNode()->renderer()
+    // with rendererOfAnchorNode().
+    RenderObject* rendererOfAnchorNode() const;
+
+    // New code should not use this function.
+    int deprecatedOffsetInRendererOfAnchorNode() const;
+
     // FIXME: Callers should be moved off of node(), node() is not always the container for this position.
     // For nodes which editingIgnoresContent(node()) returns true, positions like [ignoredNode, 0]
     // will be treated as before ignoredNode (thus node() is really after the position, not containing it).