Only communicate CSSPrimitiveValue references from SVGLength

third_party/WebKit/Source/core/svg/SVGAnimatedLength.h

Index: third_party/WebKit/Source/core/svg/SVGAnimatedLength.h
diff --git a/third_party/WebKit/Source/core/svg/SVGAnimatedLength.h b/third_party/WebKit/Source/core/svg/SVGAnimatedLength.h
index 35db4007773a0332ec523df1f7c32fb223710d95..5dd38ee9b64ffb4ffa2953cf70b883fe102d0901 100644
--- a/third_party/WebKit/Source/core/svg/SVGAnimatedLength.h
+++ b/third_party/WebKit/Source/core/svg/SVGAnimatedLength.h
@@ -54,6 +54,10 @@ class SVGAnimatedLength : public SVGAnimatedProperty<SVGLength>,
   void setDefaultValueAsString(const String&);
   SVGParsingError setBaseValueAsString(const String&) override;
 
+  const CSSValue* cssValue() const {
+    return &currentValue()->asCSSPrimitiveValue();
+  }
+
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
  protected: