Web Animations CSS: Split AnimatableNumber into AnimatableDouble and AnimatableLength

Source/core/animation/AnimatableDouble.cpp

Index: Source/core/animation/AnimatableDouble.cpp
diff --git a/Source/core/animation/AnimatableVisibility.cpp b/Source/core/animation/AnimatableDouble.cpp
similarity index 65%
copy from Source/core/animation/AnimatableVisibility.cpp
copy to Source/core/animation/AnimatableDouble.cpp
index 2cfc097ada77aa7750f4157b2240c07ba9ce1b0f..211452c2b5b24bd12ea4483eab700cd5ed10a425 100644
--- a/Source/core/animation/AnimatableVisibility.cpp
+++ b/Source/core/animation/AnimatableDouble.cpp
@@ -29,21 +29,35 @@
  */
 
 #include "config.h"
-#include "core/animation/AnimatableVisibility.h"
+#include "core/animation/AnimatableDouble.h"
+
+#include "core/css/CSSPrimitiveValue.h"
+#include "core/css/CSSValuePool.h"
+#include "core/platform/animation/AnimationUtilities.h"
 
 namespace WebCore {
 
-PassRefPtr<AnimatableValue> AnimatableVisibility::interpolateTo(const AnimatableValue* value, double fraction) const
+PassRefPtr<CSSValue> AnimatableDouble::toCSSValue() const
 {
-    EVisibility from = m_visibility;
-    EVisibility to = toAnimatableVisibility(value)->m_visibility;
-    if (from != VISIBLE && to != VISIBLE)
-        return defaultInterpolateTo(this, value, fraction);
-    if (fraction <= 0)
-        return takeConstRef(this);
-    if (fraction >= 1)
+    return cssValuePool().createValue(m_number, CSSPrimitiveValue::CSS_NUMBER);
+}
+
+PassRefPtr<AnimatableValue> AnimatableDouble::interpolateTo(const AnimatableValue* value, double fraction) const
+{
+    const AnimatableDouble* other = toAnimatableDouble(value);
+    return AnimatableDouble::create(blend(m_number, other->m_number, fraction));
+}
+
+PassRefPtr<AnimatableValue> AnimatableDouble::addWith(const AnimatableValue* value) const
+{
+    // Optimization for adding with 0.
+    if (!m_number)
         return takeConstRef(value);
-    return takeConstRef(from == VISIBLE ? this : value);
+    const AnimatableDouble* other = toAnimatableDouble(value);
+    if (!other->m_number)
+        return takeConstRef(this);
+
+    return AnimatableDouble::create(m_number + other->m_number);
 }
 
 } // namespace WebCore