Add AnimationTimingProperties dictionary

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/animation/Timing.h"
 
 namespace blink {
 
 class Dictionary;
+class AnimationTimingProperties;
 
 class TimingInput {
 public:
-    static Timing convert(const Dictionary& timingInputDictionary);
+    static Timing convert(const AnimationTimingProperties& timingInput);
     static Timing convert(double duration);
 
     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 void setPlaybackRate(Timing&, double playbackRate);
     static void setPlaybackDirection(Timing&, const String& direction);
     static void setTimingFunction(Timing&, const String& timingFunctionString);
 };
 
 } // namespace blink
 
 #endif