Fixing superscript and subscript baseline for tiny fonts in SVG

third_party/WebKit/Source/platform/fonts/SimpleFontData.cpp

 /*
  * Copyright (C) 2005, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov
  *
  * 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 338 matching lines @@
     const FontDescription& fontDescription) const {
   if (!m_derivedFontData)
     m_derivedFontData = DerivedFontData::create(isCustomFont());
   if (!m_derivedFontData->emphasisMark)
     m_derivedFontData->emphasisMark =
         createScaledFontData(fontDescription, emphasisMarkFontSizeMultiplier);
 
   return m_derivedFontData->emphasisMark;
 }
 
+PassRefPtr<SimpleFontData> SimpleFontData::subpixelAscentDescentFontData()
+    const {
+  return SimpleFontData::create(m_platformData, m_customFontData,
+                                m_isTextOrientationFallback, true);
+}
+
 bool SimpleFontData::isTextOrientationFallbackOf(
     const SimpleFontData* fontData) const {
   if (!isTextOrientationFallback() || !fontData->m_derivedFontData)
     return false;
   return fontData->m_derivedFontData->uprightOrientation == this ||
          fontData->m_derivedFontData->verticalRightOrientation == this;
 }
 
 std::unique_ptr<SimpleFontData::DerivedFontData>
 SimpleFontData::DerivedFontData::create(bool forCustomFont) {
@@ skipping 69 matching lines @@
     if (glyphs[i]) {
       pageToFill->setGlyphDataForIndex(offset + i, glyphs[i], this);
       haveGlyphs = true;
     }
   }
 
   return haveGlyphs;
 }
 
 }  // namespace blink