[Font Load Events] Implement FontFaceSet methods

Source/core/css/CSSSegmentedFontFace.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 176 matching lines @@
     if (callback) {
         if (isLoading())
             m_callbacks.append(callback);
         else if (checkFont())
             callback->notifyLoaded(this);
         else
             callback->notifyError(this);
     }
 }
 
+Vector<RefPtr<FontFace> > CSSSegmentedFontFace::fontFaces() const
+{
+    Vector<RefPtr<FontFace> > fontFaces;
+    unsigned size = m_fontFaces.size();
+    for (unsigned i = 0; i < size; i++) {
+        RefPtr<FontFace> face = m_fontFaces[i]->fontFace();
+        if (face)
+            fontFaces.append(face);
+    }
+    return fontFaces;
 }
+
+}