[SVG2] Elements that don't render shouldn't contribute to ancestor bboxes.

Source/core/rendering/svg/RenderSVGRect.cpp

Index: Source/core/rendering/svg/RenderSVGRect.cpp
diff --git a/Source/core/rendering/svg/RenderSVGRect.cpp b/Source/core/rendering/svg/RenderSVGRect.cpp
index 5fd79e7f626db218567312903f35270f851a0349..abfcc4ab3ce1ac98314d69d021bb40007080f769 100644
--- a/Source/core/rendering/svg/RenderSVGRect.cpp
+++ b/Source/core/rendering/svg/RenderSVGRect.cpp
@@ -129,4 +129,13 @@ bool RenderSVGRect::shapeDependentFillContains(const FloatPoint& point, const Wi
     return m_fillBoundingBox.contains(point.x(), point.y());
 }
 
+bool RenderSVGRect::isRenderingDisabled() const
+{
+    // Some combinations of attributes cause SVG elements
+    // to not render.
+    // For rects a negative dimension is an error and
+    // a zero dimension disables rendering.
+    return m_fillBoundingBox.isEmpty();
+}
+
 }