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 c06e6bb314ec13ce2f360d49db7a131557fd5cb2..cfff495a618b7dd73490bfa5d6bb6eedabf514c4 100644
--- a/Source/core/animation/AnimatableValue.h
+++ b/Source/core/animation/AnimatableValue.h
@@ -46,11 +46,12 @@ public:
     // For noncommutative values read add(A, B) to mean the value A with B composed onto it.
     static PassRefPtr<AnimatableValue> add(const AnimatableValue*, const AnimatableValue*);
 
+    bool isDouble() const { return type() == TypeDouble; }
     bool isColor() const { return type() == TypeColor; }
     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 isTransform() const { return type() == TypeTransform; }
     bool isUnknown() const { return type() == TypeUnknown; }
@@ -58,12 +59,13 @@ public:
 
 protected:
     enum AnimatableType {
+        TypeDouble,
         TypeColor,
         TypeImage,
+        TypeLength,
         TypeLengthBox,
         TypeLengthSize,
         TypeNeutral,
-        TypeNumber,
         TypeTransform,
         TypeUnknown,
         TypeVisibility,