Web Animations: Add CSSAnimatableValueFactory API (partial implementation)

Source/core/css/resolver/CSSAnimatableValueFactory.h

+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
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+ */
+
+#ifndef CSSAnimatableValueFactory_h
+#define CSSAnimatableValueFactory_h
+
+#include "CSSPropertyNames.h"
+#include "core/animation/AnimatableValue.h"
+#include "core/platform/Length.h"
+#include "wtf/PassRefPtr.h"
+
+namespace WebCore {
+
+class CSSValue;
+class RenderStyle;
+
+class CSSAnimatableValueFactory {
+public:
+    static PassRefPtr<AnimatableValue> createFromCSSValue(CSSValue*, CSSPropertyID);

[dstockwell, 2013/07/30 03:35:04]

As discussed we probably won't need this variant, we can probably drop it and
add it later if really necessary.

[alancutter (OOO until 2018), 2013/07/30 08:31:02]

Done.

+    static PassRefPtr<AnimatableValue> createFromRenderStyle(RenderStyle*, CSSPropertyID);
+private:
+    static PassRefPtr<AnimatableValue> createFromLength(const Length&, RenderStyle*);

[dstockwell, 2013/07/30 03:35:04]

Does this need to be public?

[alancutter (OOO until 2018), 2013/07/30 08:31:02]

We don't really need it at this stage, it can be exposed later if needed. For
now I removed it from the header file.

+};
+
+} // namespace WebCore
+
+#endif // CSSAnimatableValueFactory_h