Include glyph overflow in SVG text bounding boxes

third_party/WebKit/Source/core/layout/svg/SVGTextFragment.h

 /*
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 52 matching lines @@
     unsigned characterOffset;
     unsigned metricsListOffset;
     unsigned length : 31;
     unsigned isTextOnPath : 1;
 
     float x;
     float y;
     float width;
     float height;
 
+    // Top and bottom are the amounts of glyph overflows exceeding the font metrics' ascent and descent, respectively.
+    float glyphOverflowTop;

[fs, 2015/12/14 09:59:31]

I guess the time has come for me to respin and land the CL that shrinks
SVGTextFragment by roughly this amount of floats... =)

+    float glyphOverflowBottom;
+    // Left and right are the amounts of glyph overflows exceeding the left and right edge of normal layout boundary, respectively.
+    float glyphOverflowLeft;
+    float glyphOverflowRight;
+
     // Includes rotation/glyph-orientation-(horizontal|vertical) transforms, as well as orientation related shifts
     // (see SVGTextLayoutEngine, which builds this transformation).
     AffineTransform transform;
 
     // Contains lengthAdjust related transformations, which are not allowd to influence the SVGTextQuery code.
     AffineTransform lengthAdjustTransform;
 
 private:
     void transformAroundOrigin(AffineTransform& result) const
     {
@@ skipping 21 matching lines @@
 
         result = transform;
         transformAroundOrigin(result);
         result.preMultiply(lengthAdjustTransform);
     }
 };
 
 } // namespace blink
 
 #endif