Need to update first-line when font finish loading.

Source/core/layout/LayoutObject.h

Index: Source/core/layout/LayoutObject.h
diff --git a/Source/core/layout/LayoutObject.h b/Source/core/layout/LayoutObject.h
index 70f086801a6ac4c63efa7a6cdda5ac7768b84b69..ab0bfad98ae4fd89d6335b20b725642f6d76f775 100644
--- a/Source/core/layout/LayoutObject.h
+++ b/Source/core/layout/LayoutObject.h
@@ -736,6 +736,8 @@ public:
     // and so only should be called when the style is known not to have changed (or from setStyle).
     void setStyleInternal(PassRefPtr<ComputedStyle> style) { m_style = style; }
 
+    void firstLineStyleDidChange(const ComputedStyle& oldStyle, const ComputedStyle& newStyle);
+
     // returns the containing block level element for this element.
     LayoutBlock* containingBlock() const;