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

Source/core/rendering/svg/SVGRenderSupport.cpp

Index: Source/core/rendering/svg/SVGRenderSupport.cpp
diff --git a/Source/core/rendering/svg/SVGRenderSupport.cpp b/Source/core/rendering/svg/SVGRenderSupport.cpp
index 9dd0415e574bce090d11c0e3b03f23355eec91dd..cd31aef5a4c6cef225de8e1e003328d1bf195a1e 100644
--- a/Source/core/rendering/svg/SVGRenderSupport.cpp
+++ b/Source/core/rendering/svg/SVGRenderSupport.cpp
@@ -137,6 +137,10 @@ void SVGRenderSupport::computeContainerBoundingBoxes(const RenderObject* contain
         if (current->isSVGHiddenContainer())
             continue;
 
+        // Don't include elements in the union that do not render.
+        if (current->isSVGShape() && toRenderSVGShape(current)->isShapeEmpty())

[f(malita), 2014/06/25 15:16:50]

We have a similar check for containers in updateObjectBoundingBox() - maybe this
should live there too (and possibly the two can be merged, but not necessarily
in this patch).

+            continue;
+
         const AffineTransform& transform = current->localToParentTransform();
         updateObjectBoundingBox(objectBoundingBox, objectBoundingBoxValid, current,
             transform.mapRect(current->objectBoundingBox()));