Using FloatRect in SimpleShaper and remove GlyphBounds

Source/platform/fonts/shaping/HarfBuzzShaper.cpp

Index: Source/platform/fonts/shaping/HarfBuzzShaper.cpp
diff --git a/Source/platform/fonts/shaping/HarfBuzzShaper.cpp b/Source/platform/fonts/shaping/HarfBuzzShaper.cpp
index dba7381e35fc88894dab22c4c1bcbb2616ff11df..ae371f2ddf861c0ac54819b6f2c595acb4d85287 100644
--- a/Source/platform/fonts/shaping/HarfBuzzShaper.cpp
+++ b/Source/platform/fonts/shaping/HarfBuzzShaper.cpp
@@ -370,7 +370,7 @@ static void normalizeCharacters(const TextRun& run, unsigned length, UChar* dest
     }
 }
 
-HarfBuzzShaper::HarfBuzzShaper(const Font* font, const TextRun& run, ForTextEmphasisOrNot forTextEmphasis, HashSet<const SimpleFontData*>* fallbackFonts)
+HarfBuzzShaper::HarfBuzzShaper(const Font* font, const TextRun& run, ForTextEmphasisOrNot forTextEmphasis, HashSet<const SimpleFontData*>* fallbackFonts, FloatRect* bounds)
     : m_font(font)
     , m_normalizedBufferLength(0)
     , m_run(run)
@@ -382,6 +382,7 @@ HarfBuzzShaper::HarfBuzzShaper(const Font* font, const TextRun& run, ForTextEmph
     , m_fromIndex(0)
     , m_toIndex(m_run.length())
     , m_forTextEmphasis(forTextEmphasis)
+    , m_glyphBoundingBox(bounds)
     , m_fallbackFonts(fallbackFonts)
 {
     m_normalizedBuffer = adoptArrayPtr(new UChar[m_run.length() + 1]);
@@ -929,10 +930,12 @@ void HarfBuzzShaper::setGlyphPositionsForHarfBuzzRun(HarfBuzzRun* currentRun, hb
 
         currentRun->setGlyphAndPositions(i, glyph, advance, offsetX, offsetY);
 
-        FloatRect glyphBounds = currentFontData->boundsForGlyph(glyph);
-        glyphBounds.move(glyphOrigin.x(), glyphOrigin.y());
-        m_glyphBoundingBox.unite(glyphBounds);
-        glyphOrigin += FloatSize(advance + offsetX, offsetY);
+        if (m_glyphBoundingBox) {
+            FloatRect glyphBounds = currentFontData->boundsForGlyph(glyph);
+            glyphBounds.move(glyphOrigin.x(), glyphOrigin.y());
+            m_glyphBoundingBox->unite(glyphBounds);
+            glyphOrigin += FloatSize(advance + offsetX, offsetY);
+        }
 
         totalAdvance += advance;
     }