Add additive animation support for CSS property background-position

third_party/WebKit/Source/core/animation/LengthListPropertyFunctions.h

Index: third_party/WebKit/Source/core/animation/LengthListPropertyFunctions.h
diff --git a/third_party/WebKit/Source/core/animation/LengthListPropertyFunctions.h b/third_party/WebKit/Source/core/animation/LengthListPropertyFunctions.h
index 0174a423bf32ea21d64b43706a679fabccad38d3..b15720dd112b0ab346f46baa85605dec2053c778 100644
--- a/third_party/WebKit/Source/core/animation/LengthListPropertyFunctions.h
+++ b/third_party/WebKit/Source/core/animation/LengthListPropertyFunctions.h
@@ -6,40 +6,20 @@
 #define LengthListPropertyFunctions_h
 
 #include "core/CSSPropertyNames.h"
-#include "core/style/ComputedStyle.h"
 #include "platform/Length.h"
-#include "wtf/Allocator.h"
-#include "wtf/RefVector.h"
+#include "wtf/Vector.h"
 
 namespace blink {
 
+class ComputedStyle;
+
 class LengthListPropertyFunctions {
     STATIC_ONLY(LengthListPropertyFunctions);
 public:
-    static ValueRange valueRange(CSSPropertyID property)
-    {
-        ASSERT(property == CSSPropertyStrokeDasharray);
-        return ValueRangeNonNegative;
-    }
-
-    static const RefVector<Length>* getInitialLengthList(CSSPropertyID property)
-    {
-        ASSERT(property == CSSPropertyStrokeDasharray);
-        return nullptr;
-    }
-
-    static const RefVector<Length>* getLengthList(CSSPropertyID property, const ComputedStyle& style)
-    {
-        ASSERT(property == CSSPropertyStrokeDasharray);
-        return style.strokeDashArray();
-    }
-
-    static void setLengthList(CSSPropertyID property, ComputedStyle& style, PassRefPtr<RefVector<Length>> lengthList)
-    {
-        ASSERT(property == CSSPropertyStrokeDasharray);
-        style.setStrokeDashArray(lengthList);
-    }
-
+    static ValueRange valueRange(CSSPropertyID);
+    static Vector<Length> getInitialLengthList(CSSPropertyID);
+    static Vector<Length> getLengthList(CSSPropertyID, const ComputedStyle&);
+    static void setLengthList(CSSPropertyID, ComputedStyle&, Vector<Length>&& lengthList);
 };
 
 } // namespace blink