Support per property CSS Animation stacks

Source/core/css/resolver/StyleResolver.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 57 matching lines @@
 };
 
 enum RuleMatchingBehavior {
     MatchAllRules,
     MatchAllRulesExcludingSMIL
 };
 
 const unsigned styleSharingListSize = 15;
 const unsigned styleSharingMaxDepth = 32;
 typedef WillBeHeapDeque<RawPtrWillBeMember<Element>, styleSharingListSize> StyleSharingList;
+using ActiveInterpolationsMap = HashMap<PropertyHandle, Vector<RefPtr<Interpolation>, 1>>;
 
 // This class selects a ComputedStyle for a given element based on a collection of stylesheets.
 class CORE_EXPORT StyleResolver final : public NoBaseWillBeGarbageCollectedFinalized<StyleResolver> {
     WTF_MAKE_NONCOPYABLE(StyleResolver); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(StyleResolver);
 public:
     explicit StyleResolver(Document&);
     virtual ~StyleResolver();
 
     // FIXME: StyleResolver should not be keeping tree-walk state.
     // These should move to some global tree-walk state, or should be contained in a
@@ skipping 120 matching lines @@
 
     void applyMatchedProperties(StyleResolverState&, const MatchResult&);
     bool applyAnimatedProperties(StyleResolverState&, const Element* animatingElement);
     void applyCallbackSelectors(StyleResolverState&);
 
     template <CSSPropertyPriority priority>
     void applyMatchedProperties(StyleResolverState&, const MatchedPropertiesRange&, bool important, bool inheritedOnly);
     template <CSSPropertyPriority priority>
     void applyProperties(StyleResolverState&, const StylePropertySet* properties, bool isImportant, bool inheritedOnly, PropertyWhitelistType = PropertyWhitelistNone);
     template <CSSPropertyPriority priority>
-    void applyAnimatedProperties(StyleResolverState&, const HashMap<PropertyHandle, RefPtr<Interpolation>>&);
+    void applyAnimatedProperties(StyleResolverState&, const ActiveInterpolationsMap&);
     template <CSSPropertyPriority priority>
     void applyAllProperty(StyleResolverState&, CSSValue*, bool inheritedOnly, PropertyWhitelistType);
 
     bool pseudoStyleForElementInternal(Element&, const PseudoStyleRequest&, const ComputedStyle* parentStyle, StyleResolverState&);
     bool hasAuthorBackground(const StyleResolverState&);
     bool hasAuthorBorder(const StyleResolverState&);
 
     PassRefPtrWillBeRawPtr<PseudoElement> createPseudoElement(Element* parent, PseudoId);
 
     Document& document() { return *m_document; }
@@ skipping 30 matching lines @@
 
     OwnPtr<StyleResolverStats> m_styleResolverStats;
 
     // Use only for Internals::updateStyleAndReturnAffectedElementCount.
     unsigned m_accessCount;
 };
 
 } // namespace blink
 
 #endif // StyleResolver_h