Web Animations: Throw TypeErrors for invalid timing parameters

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef TimingInput_h
 #define TimingInput_h
 
 #include "core/CoreExport.h"
 #include "core/animation/Timing.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class Dictionary;
 class Document;
 class ExceptionState;
 class KeyframeEffectOptions;
+class UnrestrictedDoubleOrString;
 
 class CORE_EXPORT TimingInput {
     STATIC_ONLY(TimingInput);
 public:
     static bool convert(const KeyframeEffectOptions& timingInput, Timing& timingOutput, Document*, ExceptionState&);
-    static Timing convert(double duration);
+    static bool convert(double duration, Timing& timingOutput, ExceptionState&);
 
     static void setStartDelay(Timing&, double startDelay);
     static void setEndDelay(Timing&, double endDelay);
     static void setFillMode(Timing&, const String& fillMode);
-    static void setIterationStart(Timing&, double iterationStart);
-    static void setIterationCount(Timing&, double iterationCount);
-    static void setIterationDuration(Timing&, double iterationDuration);
+    static bool setIterationStart(Timing&, double iterationStart, ExceptionState&);
+    static bool setIterationCount(Timing&, double iterationCount, ExceptionState&);
+    static bool setIterationDuration(Timing&, const UnrestrictedDoubleOrString&, ExceptionState&);
     static void setPlaybackRate(Timing&, double playbackRate);
     static void setPlaybackDirection(Timing&, const String& direction);
     static bool setTimingFunction(Timing&, const String& timingFunctionString, Document*, ExceptionState&);
 };
 
 } // namespace blink
 
 #endif