Web Animations CSS: Split AnimatableNumber into AnimatableDouble and AnimatableLength

Source/core/animation/AnimatableValue.h

Index: Source/core/animation/AnimatableValue.h
diff --git a/Source/core/animation/AnimatableValue.h b/Source/core/animation/AnimatableValue.h
index be4f8a8172eac63017c2f472e7c744176a20b252..c45d471041fd1fc4fa45a78661819a86d5abd453 100644
--- a/Source/core/animation/AnimatableValue.h
+++ b/Source/core/animation/AnimatableValue.h
@@ -48,10 +48,11 @@ public:
 
     bool isClipPathOperation() const { return type() == TypeClipPathOperation; }
     bool isColor() const { return type() == TypeColor; }
+    bool isDouble() const { return type() == TypeDouble; }
     bool isImage() const { return type() == TypeImage; }
+    bool isLength() const { return type() == TypeLength; }
     bool isLengthBox() const { return type() == TypeLengthBox; }
     bool isLengthSize() const { return type() == TypeLengthSize; }
-    bool isNumber() const { return type() == TypeNumber; }
     bool isNeutral() const { return type() == TypeNeutral; }
     bool isShapeValue() const { return type() == TypeShapeValue; }
     bool isTransform() const { return type() == TypeTransform; }
@@ -62,11 +63,12 @@ protected:
     enum AnimatableType {
         TypeClipPathOperation,
         TypeColor,
+        TypeDouble,
         TypeImage,
+        TypeLength,
         TypeLengthBox,
         TypeLengthSize,
         TypeNeutral,
-        TypeNumber,
         TypeShapeValue,
         TypeTransform,
         TypeUnknown,