Animations: Add the effect clipping primitive to web animations

Source/core/animation/Animation.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 115 matching lines @@
 #endif
 
     double calculateStartTime(double currentTime) const;
     bool hasStartTime() const { return !isNull(m_startTime); }
     double startTime(bool& isNull) const;
     double startTime() const;
     double startTimeInternal() const { return m_startTime; }
     void setStartTime(double);
     void setStartTimeInternal(double);
 
+    double startClip() const { return startClipInternal() * 1000; }
+    double endClip() const { return endClipInternal() * 1000; }
+    void setStartClip(double t) { setStartClipInternal(t / 1000); }
+    void setEndClip(double t) { setEndClipInternal(t / 1000); }
+
     const AnimationEffect* source() const { return m_content.get(); }
     AnimationEffect* source() { return m_content.get(); }
     void setSource(AnimationEffect*);
 
     // Pausing via this method is not reflected in the value returned by
     // paused() and must never overlap with pausing via pause().
     void pauseForTesting(double pauseTime);
     // This should only be used for CSS
     void unpause();
 
@@ skipping 49 matching lines @@
     void createCompositorPlayer();
     void destroyCompositorPlayer();
     void attachCompositorTimeline();
     void detachCompositorTimeline();
     void attachCompositedLayers();
     void detachCompositedLayers();
     // WebCompositorAnimationDelegate implementation.
     void notifyAnimationStarted(double monotonicTime, int group) override;
     void notifyAnimationFinished(double monotonicTime, int group) override { }
 
+    double startClipInternal() const { return m_startClip; };
+    double endClipInternal() const { return m_endClip; };
+    void setStartClipInternal(double t) { m_startClip = t; }
+    void setEndClipInternal(double t) { m_endClip = t; }
+    bool clipped(double);
+    double clipTimeToEffectChange(double) const;
+
     AnimationPlayState m_playState;
     double m_playbackRate;
     double m_startTime;
     double m_holdTime;
+    double m_startClip;
+    double m_endClip;
 
     unsigned m_sequenceNumber;
 
     typedef ScriptPromiseProperty<RawPtrWillBeMember<Animation>, RawPtrWillBeMember<Animation>, Member<DOMException>> AnimationPromise;
     PersistentWillBeMember<AnimationPromise> m_finishedPromise;
     PersistentWillBeMember<AnimationPromise> m_readyPromise;
 
     RefPtrWillBeMember<AnimationEffect> m_content;
     RawPtrWillBeMember<AnimationTimeline> m_timeline;
     // Reflects all pausing, including via pauseForTesting().
@@ skipping 60 matching lines @@
 
     OwnPtr<WebCompositorAnimationPlayer> m_compositorPlayer;
 
     bool m_currentTimePending;
     bool m_stateIsBeingUpdated;
 };
 
 } // namespace blink
 
 #endif // Animation_h