Use a converter for -webkit-clip-path

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 2607587ecc0d9ecd4ff97ee5a03d7ed8bb10793b..be7e02298a8626802ceb1db6ba25056b00ecebf7 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
@@ -45,6 +45,7 @@
 #include "core/css/CSSValuePair.h"
 #include "core/css/resolver/FilterOperationResolver.h"
 #include "core/frame/LocalFrame.h"
+#include "core/style/ClipPathOperation.h"
 #include "core/style/TextSizeAdjust.h"
 #include "core/svg/SVGURIReference.h"
 #include "platform/transforms/RotateTransformOperation.h"
@@ -117,6 +118,20 @@ LengthBox StyleBuilderConverter::convertClip(StyleResolverState& state, const CS
         convertLengthOrAuto(state, *rect.left()));
 }
 
+PassRefPtr<ClipPathOperation> StyleBuilderConverter::convertClipPath(StyleResolverState& state, const CSSValue& value)
+{
+    if (value.isBasicShapeValue())
+        return ShapeClipPathOperation::create(basicShapeForValue(state, value));
+    if (value.isURIValue()) {
+        String cssURLValue = toCSSURIValue(value).value();
+        KURL url = state.document().completeURL(cssURLValue);
+        // TODO(fs): Doesn't work with forward or external SVG references (crbug.com/391604, crbug.com/109212, ...)
+        return ReferenceClipPathOperation::create(cssURLValue, AtomicString(url.fragmentIdentifier()));
+    }
+    DCHECK(value.isPrimitiveValue() && toCSSPrimitiveValue(value).getValueID() == CSSValueNone);
+    return nullptr;
+}
+
 FilterOperations StyleBuilderConverter::convertFilterOperations(StyleResolverState& state, const CSSValue& value)
 {
     return FilterOperationResolver::createFilterOperations(state, value);