Don't unconditionally generate a layout object for SVG <stop> elements.

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

Index: third_party/WebKit/Source/core/svg/SVGStopElement.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGStopElement.cpp b/third_party/WebKit/Source/core/svg/SVGStopElement.cpp
index 1ed3eeb894dd8a76ab158a3da476c905d7ac7fda..21af79c0f989e1e95795701eaae44eb0b0546588 100644
--- a/third_party/WebKit/Source/core/svg/SVGStopElement.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGStopElement.cpp
@@ -56,7 +56,7 @@ LayoutObject* SVGStopElement::createLayoutObject(const ComputedStyle&) {
 }
 
 bool SVGStopElement::layoutObjectIsNeeded(const ComputedStyle&) {
-  return true;
+  return isValid() && hasSVGParent();
 }
 
 Color SVGStopElement::stopColorIncludingOpacity() const {