Merge CSSSVGDocumentValue with CSSURIValue

third_party/WebKit/Source/core/animation/FilterInterpolationFunctions.cpp

Index: third_party/WebKit/Source/core/animation/FilterInterpolationFunctions.cpp
diff --git a/third_party/WebKit/Source/core/animation/FilterInterpolationFunctions.cpp b/third_party/WebKit/Source/core/animation/FilterInterpolationFunctions.cpp
index b12ffaf59feed844e18a14ca169935c0687878d0..7c1fbd98833a24235700e7d835283d66af92e520 100644
--- a/third_party/WebKit/Source/core/animation/FilterInterpolationFunctions.cpp
+++ b/third_party/WebKit/Source/core/animation/FilterInterpolationFunctions.cpp
@@ -91,8 +91,11 @@ double clampParameter(double value, FilterOperation::OperationType type)
 
 InterpolationValue FilterInterpolationFunctions::maybeConvertCSSFilter(const CSSValue& value)
 {
+    if (value.isURIValue())
+        return nullptr;
+
     const CSSFunctionValue& filter = toCSSFunctionValue(value);
-    ASSERT(filter.length() <= 1);
+    DCHECK_LE(filter.length(), 1u);
     FilterOperation::OperationType type = FilterOperationResolver::filterOperationForType(filter.functionType());
     InterpolationValue result = nullptr;
 
@@ -136,9 +139,6 @@ InterpolationValue FilterInterpolationFunctions::maybeConvertCSSFilter(const CSS
         break;
     }
 
-    case FilterOperation::REFERENCE:
-        return nullptr;
-
     default:
         NOTREACHED();
         return nullptr;