Add unit test for GlyphPageTreeNode.

Source/platform/fonts/GlyphPageTreeNode.cpp

 /*
  * Copyright (C) 2006, 2007, 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
@@ skipping 106 matching lines @@
     if (pageZeroRoot)
         pageZeroRoot->pruneFontData(fontData);
 }
 
 static bool fill(GlyphPage* pageToFill, unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength, const SimpleFontData* fontData)
 {
 #if ENABLE(SVG_FONTS)
     if (fontData->isSVGFont())
         return fontData->customFontData()->fillSVGGlyphPage(pageToFill, offset, length, buffer, bufferLength, fontData);
 #endif
-    bool hasGlyphs = pageToFill->fill(offset, length, buffer, bufferLength, fontData);
+    bool hasGlyphs = fontData->fillGlyphPage(pageToFill, offset, length, buffer, bufferLength);
 #if ENABLE(OPENTYPE_VERTICAL)
     if (hasGlyphs && fontData->verticalData())
         fontData->verticalData()->substituteWithVerticalGlyphs(fontData, pageToFill, offset, length);
 #endif
     return hasGlyphs;
 }
 
 void GlyphPageTreeNode::initializePage(const FontData* fontData, unsigned pageNumber)
 {
     ASSERT(!m_page);
@@ skipping 290 matching lines @@
         printf("\nPage %d:\n", it->key);
         showGlyphPageTree(it->key);
     }
 }
 
 void showGlyphPageTree(unsigned pageNumber)
 {
     WebCore::GlyphPageTreeNode::getRoot(pageNumber)->showSubtree();
 }
 #endif