Store glyph bounds in WordMeasurement to avoid slow path width calc

Source/core/layout/LayoutBR.h

Index: Source/core/layout/LayoutBR.h
diff --git a/Source/core/layout/LayoutBR.h b/Source/core/layout/LayoutBR.h
index f75e74b6126f3b2e888e086913b2dc3c374492dc..ba362bbf9deace31e296774418c1ca56bf84eeeb 100644
--- a/Source/core/layout/LayoutBR.h
+++ b/Source/core/layout/LayoutBR.h
@@ -38,8 +38,8 @@ public:
 
     virtual LayoutRect selectionRectForPaintInvalidation(const LayoutBoxModelObject* /* paintInvalidationContainer */) const override { return LayoutRect(); }
 
-    virtual float width(unsigned /* from */, unsigned /* len */, const Font&, LayoutUnit /* xpos */, TextDirection, HashSet<const SimpleFontData*>* = nullptr /* fallbackFonts */ , GlyphOverflow* = nullptr) const override { return 0; }
-    virtual float width(unsigned /* from */, unsigned /* len */, LayoutUnit /* xpos */, TextDirection, bool = false /* firstLine */, HashSet<const SimpleFontData*>* = nullptr /* fallbackFonts */, GlyphOverflow* = nullptr) const override { return 0; }
+    virtual float width(unsigned /* from */, unsigned /* len */, const Font&, LayoutUnit /* xpos */, TextDirection, HashSet<const SimpleFontData*>* = nullptr /* fallbackFonts */ , FloatRect* /* glyphBounds */ = nullptr) const override { return 0; }
+    virtual float width(unsigned /* from */, unsigned /* len */, LayoutUnit /* xpos */, TextDirection, bool = false /* firstLine */, HashSet<const SimpleFontData*>* = nullptr /* fallbackFonts */, FloatRect* /* glyphBounds */ = nullptr) const override { return 0; }
 
     int lineHeight(bool firstLine) const;