Remove effective zoom from font metrics before SVG text layout.

Source/core/layout/svg/SVGTextLayoutEngineBaseline.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 18 matching lines @@
 class Font;
 class LayoutObject;
 class ComputedStyle;
 class SVGComputedStyle;
 class SVGTextMetrics;
 
 // Helper class used by SVGTextLayoutEngine to handle 'alignment-baseline' / 'dominant-baseline' and 'baseline-shift'.
 class SVGTextLayoutEngineBaseline {
     WTF_MAKE_NONCOPYABLE(SVGTextLayoutEngineBaseline);
 public:
-    SVGTextLayoutEngineBaseline(const Font&);
+    SVGTextLayoutEngineBaseline(const Font&, float effectiveZoom);
 
     float calculateBaselineShift(const ComputedStyle&) const;
     float calculateAlignmentBaselineShift(bool isVerticalText, const LayoutObject* textRenderer) const;
     float calculateGlyphOrientationAngle(bool isVerticalText, const SVGComputedStyle&, const UChar& character) const;
     float calculateGlyphAdvanceAndOrientation(bool isVerticalText, const SVGTextMetrics&, float angle, float& xOrientationShift, float& yOrientationShift) const;
 
 private:
     EAlignmentBaseline dominantBaselineToAlignmentBaseline(bool isVerticalText, const LayoutObject* textRenderer) const;
 
     const Font& m_font;
+
+    // Everything we read from the m_font's font descriptor during layout is scaled by the effective
+    // zoom, as fonts always are in computed style. Since layout inside SVG takes place in unzoomed
+    // coordinates we have to compensate for zoom when reading values from the font descriptor.
+    float m_effectiveZoom;
 };
 
 } // namespace blink
 
 #endif