Need to update first-line when font finish loading.

Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1689 matching lines @@
     if (isImage() || isQuote()) {
         RefPtr<ComputedStyle> style = ComputedStyle::create();
         style->inheritFrom(*pseudoStyle);
         setStyle(style.release());
         return;
     }
 
     setStyle(pseudoStyle);
 }
 
+void LayoutObject::firstLineStyleDidChange(const ComputedStyle& oldStyle, const ComputedStyle& newStyle)
+{
+    StyleDifference diff = oldStyle.visualInvalidationDiff(newStyle);
+    if (diff.hasDifference()) {
+        // TODO(rune@opera.com): We should use the diff to determine whether a repaint vs. layout
+        // is needed, but for now just assume a layout will be required. The diff code
+        // in LayoutObject::setStyle would need to be factored out so that it could be reused.
+        setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::StyleChange);
+    }
+}
+
 void LayoutObject::markContainingBlocksForOverflowRecalc()
 {
     for (LayoutBlock* container = containingBlock(); container && !container->childNeedsOverflowRecalcAfterStyleChange(); container = container->containingBlock())
         container->setChildNeedsOverflowRecalcAfterStyleChange(true);
 }
 
 void LayoutObject::setNeedsOverflowRecalcAfterStyleChange()
 {
     bool neededRecalc = needsOverflowRecalcAfterStyleChange();
     setSelfNeedsOverflowRecalcAfterStyleChange(true);
@@ skipping 1534 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif