Disable display: contents in SVG.

third_party/WebKit/Source/core/svg/SVGElement.cpp

Index: third_party/WebKit/Source/core/svg/SVGElement.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGElement.cpp b/third_party/WebKit/Source/core/svg/SVGElement.cpp
index 88b13cabd79b091f5a2cf4d69f8c1e4987973a16..41ce743cf7e10c025ac8df688eef8c7798bf9d70 100644
--- a/third_party/WebKit/Source/core/svg/SVGElement.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGElement.cpp
@@ -1026,6 +1026,27 @@ PassRefPtr<ComputedStyle> SVGElement::customStyleForLayoutObject() {
       correspondingElement(), style, DisallowStyleSharing);
 }
 
+bool SVGElement::layoutObjectIsNeeded(const ComputedStyle& style) {
+  // SVG elements only render when inside <svg>, or if the element is an <svg>
+  // itself.
+  if (!isSVGSVGElement(*this) &&
+      (!parentNode() || !parentNode()->isSVGElement())) {
+    return false;
+  }
+
+  if (!isValid())
+    return false;
+
+  // Ignore display: contents, since it isn't really specified for SVG and Gecko
+  // doesn't take display into account at all for SVG (except display: none).
+  //
+  // [1]: https://www.w3.org/TR/SVG/painting.html#DisplayProperty
+  if (style.display() == EDisplay::Contents)
+    return true;
+
+  return Element::layoutObjectIsNeeded(style);
+}
+
 MutableStylePropertySet* SVGElement::animatedSMILStyleProperties() const {
   if (hasSVGRareData())
     return svgRareData()->animatedSMILStyleProperties();