Add support for <basic-shape> to 'clip-path' on SVG elements

third_party/WebKit/Source/core/layout/svg/SVGResources.cpp

Index: third_party/WebKit/Source/core/layout/svg/SVGResources.cpp
diff --git a/third_party/WebKit/Source/core/layout/svg/SVGResources.cpp b/third_party/WebKit/Source/core/layout/svg/SVGResources.cpp
index 74f3c87a317d0f5ad6bb26fb6e57cfef1f5ddb54..fa1b08389fc9103c2451cde3009fe6ceca135c21 100644
--- a/third_party/WebKit/Source/core/layout/svg/SVGResources.cpp
+++ b/third_party/WebKit/Source/core/layout/svg/SVGResources.cpp
@@ -214,10 +214,13 @@ std::unique_ptr<SVGResources> SVGResources::buildResources(const LayoutObject* o
 
     std::unique_ptr<SVGResources> resources;
     if (clipperFilterMaskerTags().contains(tagName)) {
-        if (style.hasClipper()) {
-            AtomicString id = style.clipperResource();
-            if (!ensureResources(resources).setClipper(getLayoutSVGResourceById<LayoutSVGResourceClipper>(treeScope, id)))
-                registerPendingResource(extensions, id, element);
+        if (ClipPathOperation* clipPathOperation = style.clipPath()) {
+            if (clipPathOperation->type() == ClipPathOperation::REFERENCE) {
+                const ReferenceClipPathOperation& clipPathReference = toReferenceClipPathOperation(*clipPathOperation);
+                AtomicString id = SVGURIReference::fragmentIdentifierFromIRIString(clipPathReference.url(), treeScope);
+                if (!ensureResources(resources).setClipper(getLayoutSVGResourceById<LayoutSVGResourceClipper>(treeScope, id)))
+                    registerPendingResource(extensions, id, element);
+            }
         }
 
         if (computedStyle.hasFilter() && !object->isSVGRoot())  {