Update animation when changes in animation keyframes are detected.

Source/core/animation/css/CSSAnimations.h

Index: Source/core/animation/css/CSSAnimations.h
diff --git a/Source/core/animation/css/CSSAnimations.h b/Source/core/animation/css/CSSAnimations.h
index 3dab7d2eb68fb34572d79ceb2ed5d433cefb6a36..e65665c68c0b91de34c76c848970694ba3a7ceb3 100644
--- a/Source/core/animation/css/CSSAnimations.h
+++ b/Source/core/animation/css/CSSAnimations.h
@@ -55,12 +55,13 @@ class StyleRuleKeyframes;
 // This includes updates to animations/transitions as well as the Interpolations to be applied.
 class CSSAnimationUpdate final : public NoBaseWillBeGarbageCollectedFinalized<CSSAnimationUpdate> {
 public:
-    void startAnimation(const AtomicString& animationName, PassRefPtrWillBeRawPtr<InertAnimation> animation)
+    void startAnimation(const AtomicString& animationName, PassRefPtrWillBeRawPtr<InertAnimation> animation, const Timing &newTiming)
     {
         animation->setName(animationName);
         NewAnimation newAnimation;
         newAnimation.name = animationName;
         newAnimation.animation = animation;
+        newAnimation.newTiming = newTiming;
         m_newAnimations.append(newAnimation);
     }
     // Returns whether player has been suppressed and should be filtered during style application.
@@ -74,13 +75,14 @@ public:
     {
         m_animationsWithPauseToggled.append(name);
     }
-    void updateAnimationTiming(AnimationPlayer* player, PassRefPtrWillBeRawPtr<InertAnimation> animation, const Timing& timing)
+    void updateAnimation(AnimationPlayer* player, PassRefPtrWillBeRawPtr<InertAnimation> animation, const Timing& newTiming, unsigned styleChangeCounter)
     {
-        UpdatedAnimationTiming updatedAnimation;
+        UpdatedAnimation updatedAnimation;
         updatedAnimation.player = player;
         updatedAnimation.animation = animation;
-        updatedAnimation.newTiming = timing;
-        m_animationsWithTimingUpdates.append(updatedAnimation);
+        updatedAnimation.newTiming = newTiming;
+        updatedAnimation.styleChangeCounter = styleChangeCounter;
+        m_animationsWithUpdates.append(updatedAnimation);
         m_suppressedAnimationPlayers.add(player);
     }
 
@@ -108,9 +110,10 @@ public:
 
         AtomicString name;
         RefPtrWillBeMember<InertAnimation> animation;
+        Timing newTiming;
     };
 
-    struct UpdatedAnimationTiming {
+    struct UpdatedAnimation {
         ALLOW_ONLY_INLINE_ALLOCATION();
     public:
         void trace(Visitor* visitor)
@@ -122,13 +125,14 @@ public:
         RawPtrWillBeMember<AnimationPlayer> player;
         RefPtrWillBeMember<InertAnimation> animation;
         Timing newTiming;
+        unsigned styleChangeCounter;
     };
 
     const WillBeHeapVector<NewAnimation>& newAnimations() const { return m_newAnimations; }
     const Vector<AtomicString>& cancelledAnimationNames() const { return m_cancelledAnimationNames; }
     const WillBeHeapHashSet<RawPtrWillBeMember<const AnimationPlayer>>& suppressedAnimationAnimationPlayers() const { return m_suppressedAnimationPlayers; }
     const Vector<AtomicString>& animationsWithPauseToggled() const { return m_animationsWithPauseToggled; }
-    const WillBeHeapVector<UpdatedAnimationTiming>& animationsWithTimingUpdates() const { return m_animationsWithTimingUpdates; }
+    const WillBeHeapVector<UpdatedAnimation>& animationsWithUpdates() const { return m_animationsWithUpdates; }
 
     struct NewTransition {
         ALLOW_ONLY_INLINE_ALLOCATION();
@@ -162,7 +166,7 @@ public:
             && m_cancelledAnimationNames.isEmpty()
             && m_suppressedAnimationPlayers.isEmpty()
             && m_animationsWithPauseToggled.isEmpty()
-            && m_animationsWithTimingUpdates.isEmpty()
+            && m_animationsWithUpdates.isEmpty()
             && m_newTransitions.isEmpty()
             && m_cancelledTransitions.isEmpty()
             && m_activeInterpolationsForAnimations.isEmpty()
@@ -180,7 +184,7 @@ private:
     Vector<AtomicString> m_cancelledAnimationNames;
     WillBeHeapHashSet<RawPtrWillBeMember<const AnimationPlayer>> m_suppressedAnimationPlayers;
     Vector<AtomicString> m_animationsWithPauseToggled;
-    WillBeHeapVector<UpdatedAnimationTiming> m_animationsWithTimingUpdates;
+    WillBeHeapVector<UpdatedAnimation> m_animationsWithUpdates;
 
     NewTransitionMap m_newTransitions;
     HashSet<CSSPropertyID> m_cancelledTransitions;
@@ -236,6 +240,9 @@ private:
     using TransitionMap = WillBeHeapHashMap<CSSPropertyID, RunningTransition>;
     TransitionMap m_transitions;
 
+    using TimingMap = WillBeHeapHashMap<AtomicString, Timing>;
+    TimingMap m_timings;
+
     OwnPtrWillBeMember<CSSAnimationUpdate> m_pendingUpdate;
 
     WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<Interpolation>> m_previousActiveInterpolationsForAnimations;
@@ -290,6 +297,6 @@ private:
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::CSSAnimationUpdate::NewAnimation);
-WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::CSSAnimationUpdate::UpdatedAnimationTiming);
+WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::CSSAnimationUpdate::UpdatedAnimation);
 
 #endif