[SVG] Fix CSS transform handling when zoomed.

Source/core/svg/SVGGraphicsElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  *
  * 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,
@@ skipping 56 matching lines @@
 
     // If CSS property was set, use that, otherwise fallback to attribute (if set).
     if (style && style->hasTransform()) {
         // Note: objectBoundingBox is an emptyRect for elements like pattern or clipPath.
         // See the "Object bounding box units" section of http://dev.w3.org/csswg/css3-transforms/
         TransformationMatrix transform;
         style->applyTransform(transform, renderer()->objectBoundingBox());
 
         // Flatten any 3D transform.
         matrix = transform.toAffineTransform();
+
+        // CSS bakes the zoom factor into lengths, including translation components.
+        // In order to align CSS & SVG transforms, we need to invert this operation.
+        float zoom = style->effectiveZoom();
+        if (zoom != 1) {
+            matrix.setE(matrix.e() / zoom);
+            matrix.setF(matrix.f() / zoom);
+        }
     } else {
         transformCurrentValue().concatenate(matrix);
     }
 
     if (m_supplementalTransform)
         return *m_supplementalTransform * matrix;
     return matrix;
 }
 
 AffineTransform* SVGGraphicsElement::supplementalTransform()
@@ skipping 80 matching lines @@
 }
 
 void SVGGraphicsElement::toClipPath(Path& path)
 {
     updatePathFromGraphicsElement(this, path);
     // FIXME: How do we know the element has done a layout?
     path.transform(animatedLocalTransform());
 }
 
 }