Use an SVGElementProxy in ReferenceClipPathOperation

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 846f72c07ff5910c8414f80f4d3dac13153c2cc8..8a440b8d22faf05b063f0b0d7fa342a015b30cbe 100644
--- a/third_party/WebKit/Source/core/svg/SVGElement.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGElement.cpp
@@ -1174,6 +1174,13 @@ bool SVGElement::isAnimatableAttribute(const QualifiedName& name) const {
 }
 #endif  // DCHECK_IS_ON()
 
+SVGElementProxySet* SVGElement::elementProxySet() {
+  // Limit to specific element types.

[pdr., 2016/11/15 04:14:35]

Nit: the comment above SVGElementProxySet needs to be updated to mention
clippath. Maybe just point that comment to this code?

[fs, 2016/11/15 14:10:56]

Updated that comment to point to this method.

+  if (!isSVGFilterElement(*this) && !isSVGClipPathElement(*this))
+    return nullptr;
+  return &ensureSVGRareData()->ensureElementProxySet();
+}
+
 SVGElementSet* SVGElement::setOfIncomingReferences() const {
   if (!hasSVGRareData())
     return nullptr;