Performance related change, Optimization for / and % operator.

Source/platform/fonts/GlyphPage.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2013 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. 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.
@@ skipping 80 matching lines @@
         else {
             for (size_t i = 0; i < GlyphPage::size; ++i) {
                 page->m_perGlyphFontData[i] = m_glyphs[i] ? m_fontDataForAllGlyphs : 0;
             }
         }
         return page.release();
     }
 
     ~GlyphPage() { }
 
-    static const size_t size = 256; // Covers Latin-1 in a single page.
-    static unsigned indexForCharacter(UChar32 c) { return c % GlyphPage::size; }
+    static const unsigned char sizeBits = 8;
+    static const size_t size = (1 << GlyphPage::sizeBits); // Covers Latin-1 in a single page.
+    static unsigned indexForCharacter(UChar32 c) { return c & 0xFF; }
 
     ALWAYS_INLINE GlyphData glyphDataForCharacter(UChar32 c) const
     {
         return glyphDataForIndex(indexForCharacter(c));
     }
 
     ALWAYS_INLINE GlyphData glyphDataForIndex(unsigned index) const
     {
         ASSERT_WITH_SECURITY_IMPLICATION(index < size);
         Glyph glyph = m_glyphs[index];
@@ skipping 83 matching lines @@
     const SimpleFontData* m_perGlyphFontData[0];
 };
 
 #if COMPILER(MSVC)
 #pragma warning(pop)
 #endif
 
 } // namespace WebCore
 
 #endif // GlyphPage_h