bindings: Pass is_null flag to attribute setters when they are nullable

third_party/WebKit/Source/core/animation/AnimationTimeline.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 69 matching lines @@
 
   bool IsActive();
   bool HasPendingUpdates() const {
     return !animations_needing_update_.IsEmpty();
   }
   double ZeroTime();
   double currentTime(bool& is_null);
   double currentTime();
   double CurrentTimeInternal(bool& is_null);
   double CurrentTimeInternal();
-  void setCurrentTime(double);
+  void setCurrentTime(double, bool is_null);
   void SetCurrentTimeInternal(double);
   double EffectiveTime();
   void PauseAnimationsForTesting(double);
 
   void SetAllCompositorPending(bool source_changed = false);
   void SetOutdatedAnimation(Animation*);
   void ClearOutdatedAnimation(Animation*);
   bool HasOutdatedAnimation() const { return outdated_animation_count_ > 0; }
   bool NeedsAnimationTimingUpdate();
   void InvalidateKeyframeEffects(const TreeScope&);
@@ skipping 56 matching lines @@
     Member<AnimationTimeline> timeline_;
     TaskRunnerTimer<AnimationTimelineTiming> timer_;
   };
 
   friend class AnimationAnimationTimelineTest;
 };
 
 }  // namespace blink
 
 #endif