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

third_party/WebKit/Source/core/animation/Animation.h

Index: third_party/WebKit/Source/core/animation/Animation.h
diff --git a/third_party/WebKit/Source/core/animation/Animation.h b/third_party/WebKit/Source/core/animation/Animation.h
index 88feec8c320fa27a4b0e458227efd4426e5da1a5..e45b9be09c77028d9cbfa4b18f6a23153125c1f7 100644
--- a/third_party/WebKit/Source/core/animation/Animation.h
+++ b/third_party/WebKit/Source/core/animation/Animation.h
@@ -91,7 +91,7 @@ class CORE_EXPORT Animation final : public EventTargetWithInlineData,
 
   double currentTime(bool& is_null);
   double currentTime();
-  void setCurrentTime(double new_current_time);
+  void setCurrentTime(double new_current_time, bool is_null);
 
   double CurrentTimeInternal() const;
   double UnlimitedCurrentTimeInternal() const;
@@ -136,7 +136,7 @@ class CORE_EXPORT Animation final : public EventTargetWithInlineData,
   double startTime(bool& is_null) const;
   double startTime() const;
   double StartTimeInternal() const { return start_time_; }
-  void setStartTime(double);
+  void setStartTime(double, bool is_null);
   void SetStartTimeInternal(double);
 
   const AnimationEffectReadOnly* effect() const { return content_.Get(); }