Using FloatRect in SimpleShaper and remove GlyphBounds

Source/platform/fonts/shaping/HarfBuzzShaper.h

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 38 matching lines @@
 class GlyphBuffer;
 class SimpleFontData;
 
 class HarfBuzzShaper final {
 public:
     enum ForTextEmphasisOrNot {
         NotForTextEmphasis,
         ForTextEmphasis
     };
 
-    HarfBuzzShaper(const Font*, const TextRun&, ForTextEmphasisOrNot = NotForTextEmphasis, HashSet<const SimpleFontData*>* fallbackFonts = 0);
+    HarfBuzzShaper(const Font*, const TextRun&, ForTextEmphasisOrNot = NotForTextEmphasis, HashSet<const SimpleFontData*>* fallbackFonts = 0, FloatRect* = 0);
 
     void setDrawRange(int from, int to);
     bool shape(GlyphBuffer* = 0);
     float totalWidth() { return m_totalWidth; }
     int offsetForPosition(float targetX);
     FloatRect selectionRect(const FloatPoint&, int height, int from, int to);
-    const FloatRect& glyphBoundingBox() const { return m_glyphBoundingBox; }
 
 private:
     class HarfBuzzRun {
     public:
         HarfBuzzRun(const HarfBuzzRun&);
         ~HarfBuzzRun();
 
         static PassOwnPtr<HarfBuzzRun> create(const SimpleFontData* fontData, unsigned startIndex, unsigned numCharacters, hb_direction_t direction, hb_script_t script)
         {
             return adoptPtr(new HarfBuzzRun(fontData, startIndex, numCharacters, direction, script));
@@ skipping 67 matching lines @@
 
     Vector<hb_feature_t, 4> m_features;
     Vector<OwnPtr<HarfBuzzRun>, 16> m_harfBuzzRuns;
 
     int m_fromIndex;
     int m_toIndex;
 
     ForTextEmphasisOrNot m_forTextEmphasis;
 
     float m_totalWidth;
-    FloatRect m_glyphBoundingBox;
+    FloatRect* m_glyphBoundingBox;
     HashSet<const SimpleFontData*>* m_fallbackFonts;
 
     friend struct CachedShapingResults;
 };
 
 } // namespace blink
 
 #endif // HarfBuzzShaper_h