Don't resolve non-local -webkit-clip-path references as local

third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp

Index: third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp b/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
index c1c4a2e78d007f9fc3cb09b7f82f1a394809c696..78af36751b6155059bf5bb9684851698b3f1c25f 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
@@ -124,8 +124,13 @@ PassRefPtr<ClipPathOperation> StyleBuilderConverter::convertClipPath(StyleResolv
         return ShapeClipPathOperation::create(basicShapeForValue(state, value));
     if (value.isURIValue()) {
         SVGURLReferenceResolver resolver(toCSSURIValue(value).value(), state.document());
+        // If the reference is non-local, then the fragment will remain as a
+        // null string, which makes the element lookup fail.
+        AtomicString fragmentIdentifier;
+        if (resolver.isLocal())
+            fragmentIdentifier = resolver.fragmentIdentifier();
         // TODO(fs): Doesn't work with forward or external SVG references (crbug.com/391604, crbug.com/109212, ...)
-        return ReferenceClipPathOperation::create(toCSSURIValue(value).value(), resolver.fragmentIdentifier());
+        return ReferenceClipPathOperation::create(toCSSURIValue(value).value(), fragmentIdentifier);
     }
     DCHECK(value.isPrimitiveValue() && toCSSPrimitiveValue(value).getValueID() == CSSValueNone);
     return nullptr;