Web Animations: Throw TypeErrors for invalid timing parameters

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

Index: third_party/WebKit/Source/core/animation/AnimationEffectTiming.h
diff --git a/third_party/WebKit/Source/core/animation/AnimationEffectTiming.h b/third_party/WebKit/Source/core/animation/AnimationEffectTiming.h
index 22d33d28c814e4943ec0edcbe9ff418e0cbce0eb..9a45fa905de321a2165ee5ce1a8418a6f262a7b8 100644
--- a/third_party/WebKit/Source/core/animation/AnimationEffectTiming.h
+++ b/third_party/WebKit/Source/core/animation/AnimationEffectTiming.h
@@ -32,9 +32,9 @@ public:
     void setDelay(double);
     void setEndDelay(double);
     void setFill(String);
-    void setIterationStart(double);
-    void setIterations(double);
-    void setDuration(const UnrestrictedDoubleOrString&);
+    void setIterationStart(double, ExceptionState&);
+    void setIterations(double, ExceptionState&);
+    void setDuration(const UnrestrictedDoubleOrString&, ExceptionState&);
     void setPlaybackRate(double);
     void setDirection(String);
     void setEasing(String, ExceptionState&);