Implemented additive animations for length

Source/core/css/resolver/StyleResolver.h

Index: Source/core/css/resolver/StyleResolver.h
diff --git a/Source/core/css/resolver/StyleResolver.h b/Source/core/css/resolver/StyleResolver.h
index edec7dc76e4ab20731bc5cde30fae28635ee0b80..6c0cfa9978d76a3fe498a188b6595ac905817f04 100644
--- a/Source/core/css/resolver/StyleResolver.h
+++ b/Source/core/css/resolver/StyleResolver.h
@@ -22,6 +22,7 @@
 #ifndef StyleResolver_h
 #define StyleResolver_h
 
+#include "core/animation/Interpolation.h"
 #include "core/css/ElementRuleCollector.h"
 #include "core/css/PseudoStyleRequest.h"
 #include "core/css/RuleFeature.h"
@@ -53,7 +54,6 @@ class CSSValue;
 class ContainerNode;
 class Document;
 class Element;
-class Interpolation;
 class MediaQueryEvaluator;
 class RuleData;
 class ScopedStyleResolver;
@@ -234,7 +234,7 @@ private:
     template <CSSPropertyPriority priority>
     void applyProperties(StyleResolverState&, const StylePropertySet* properties, bool isImportant, bool inheritedOnly, PropertyWhitelistType = PropertyWhitelistNone);
     template <CSSPropertyPriority priority>
-    void applyAnimatedProperties(StyleResolverState&, const WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<Interpolation> >&);
+    void applyAnimatedProperties(StyleResolverState&, const InterpolationPipelineMap&);
     template <CSSPropertyPriority priority>
     void applyAllProperty(StyleResolverState&, CSSValue*, bool inheritedOnly);