Allow interpolation of background-size values with keywords in CSS Animations

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

Index: third_party/WebKit/Source/core/animation/SizeListPropertyFunctions.h
diff --git a/third_party/WebKit/Source/core/animation/SizeListPropertyFunctions.h b/third_party/WebKit/Source/core/animation/SizeListPropertyFunctions.h
new file mode 100644
index 0000000000000000000000000000000000000000..59a96c0dad6bd13a0d5f668314a1bc343fecf935
--- /dev/null
+++ b/third_party/WebKit/Source/core/animation/SizeListPropertyFunctions.h
@@ -0,0 +1,28 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SizeListPropertyFunctions_h
+#define SizeListPropertyFunctions_h
+
+#include "core/CSSPropertyNames.h"
+#include "core/style/FillLayer.h"
+#include "wtf/Vector.h"
+
+namespace blink {
+
+class ComputedStyle;
+
+using SizeList = Vector<FillSize, 1>;
+
+class SizeListPropertyFunctions {
+    STATIC_ONLY(SizeListPropertyFunctions);
+public:
+    static SizeList getInitialSizeList(CSSPropertyID);
+    static SizeList getSizeList(CSSPropertyID, const ComputedStyle&);
+    static void setSizeList(CSSPropertyID, ComputedStyle&, const SizeList&);
+};
+
+} // namespace blink
+
+#endif // SizeListPropertyFunctions_h