Implemented additive animations for length

Source/core/animation/css/CSSAnimationUpdate.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CSSAnimationUpdate_h
 #define CSSAnimationUpdate_h
 
 #include "core/animation/Interpolation.h"
 #include "core/css/CSSKeyframesRule.h"
 #include "wtf/HashMap.h"
@@ skipping 128 matching lines @@
         CSSPropertyID id;
         CSSPropertyID eventId;
         RawPtrWillBeMember<const AnimatableValue> from;
         RawPtrWillBeMember<const AnimatableValue> to;
         RefPtrWillBeMember<InertAnimation> animation;
     };
     using NewTransitionMap = WillBeHeapHashMap<CSSPropertyID, NewTransition>;
     const NewTransitionMap& newTransitions() const { return m_newTransitions; }
     const HashSet<CSSPropertyID>& cancelledTransitions() const { return m_cancelledTransitions; }
 
-    void adoptActiveInterpolationsForAnimations(WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<Interpolation>>& newMap) { newMap.swap(m_activeInterpolationsForAnimations); }
-    void adoptActiveInterpolationsForTransitions(WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<Interpolation>>& newMap) { newMap.swap(m_activeInterpolationsForTransitions); }
-    const WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<Interpolation>>& activeInterpolationsForAnimations() const { return m_activeInterpolationsForAnimations; }
-    const WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<Interpolation>>& activeInterpolationsForTransitions() const { return m_activeInterpolationsForTransitions; }
-    WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<Interpolation>>& activeInterpolationsForAnimations() { return m_activeInterpolationsForAnimations; }
+    void adoptActiveInterpolationsForAnimations(InterpolationPipelineMap& newMap) { newMap.swap(m_activeInterpolationsForAnimations); }
+    void adoptActiveInterpolationsForTransitions(InterpolationPipelineMap& newMap) { newMap.swap(m_activeInterpolationsForTransitions); }
+    const InterpolationPipelineMap& activeInterpolationsForAnimations() const { return m_activeInterpolationsForAnimations; }
+    const InterpolationPipelineMap& activeInterpolationsForTransitions() const { return m_activeInterpolationsForTransitions; }
+    InterpolationPipelineMap& activeInterpolationsForAnimations() { return m_activeInterpolationsForAnimations; }
 
     bool isEmpty() const
     {
         return m_newAnimations.isEmpty()
             && m_cancelledAnimationNames.isEmpty()
             && m_suppressedAnimationPlayers.isEmpty()
             && m_animationsWithPauseToggled.isEmpty()
             && m_animationsWithUpdates.isEmpty()
             && m_newTransitions.isEmpty()
             && m_cancelledTransitions.isEmpty()
@@ skipping 10 matching lines @@
     // incomplete keyframes.
     WillBeHeapVector<NewAnimation> m_newAnimations;
     Vector<AtomicString> m_cancelledAnimationNames;
     WillBeHeapHashSet<RawPtrWillBeMember<const AnimationPlayer>> m_suppressedAnimationPlayers;
     Vector<AtomicString> m_animationsWithPauseToggled;
     WillBeHeapVector<UpdatedAnimation> m_animationsWithUpdates;
 
     NewTransitionMap m_newTransitions;
     HashSet<CSSPropertyID> m_cancelledTransitions;
 
-    WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<Interpolation>> m_activeInterpolationsForAnimations;
-    WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<Interpolation>> m_activeInterpolationsForTransitions;
+    InterpolationPipelineMap m_activeInterpolationsForAnimations;
+    InterpolationPipelineMap m_activeInterpolationsForTransitions;
 };
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::CSSAnimationUpdate::NewAnimation);
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::CSSAnimationUpdate::UpdatedAnimation);
 
 #endif