Remove effective zoom from font metrics before SVG text layout.

Source/core/layout/svg/SVGTextLayoutEngineBaseline.h

Index: Source/core/layout/svg/SVGTextLayoutEngineBaseline.h
diff --git a/Source/core/layout/svg/SVGTextLayoutEngineBaseline.h b/Source/core/layout/svg/SVGTextLayoutEngineBaseline.h
index 96e3325c05ba5e0d513eeb9a152439da2210809d..9c463cea79003a4ae347877916d12e747248b22d 100644
--- a/Source/core/layout/svg/SVGTextLayoutEngineBaseline.h
+++ b/Source/core/layout/svg/SVGTextLayoutEngineBaseline.h
@@ -36,7 +36,7 @@ class SVGTextMetrics;
 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;
@@ -47,6 +47,14 @@ 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, with zoom already in place on the graphical
+    // context, we compensate back when reading values from the font
+    // descriptor.
+    float m_effectiveZoom;
 };
 
 } // namespace blink