Web Animations API: Refactor IDL input conversion out of Animation

Source/core/animation/Timing.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 41 matching lines @@
         PlaybackDirectionAlternate,
         PlaybackDirectionAlternateReverse
     };
 
     Timing()
         : startDelay(0)
         , endDelay(0)
         , fillMode(FillModeAuto)
         , iterationStart(0)
         , iterationCount(1)
-        , iterationDuration(std::numeric_limits<double>::quiet_NaN())
+        , iterationDuration(initialIterationDuration())
         , playbackRate(1)
         , direction(PlaybackDirectionNormal)
         , timingFunction(LinearTimingFunction::create())
     {
     }
 
+    static double initialIterationDuration() { return std::numeric_limits<double>::quiet_NaN(); }
+
     void assertValid() const
     {
         ASSERT(std::isfinite(startDelay));
         ASSERT(std::isfinite(endDelay));
         ASSERT(std::isfinite(iterationStart));
         ASSERT(iterationStart >= 0);
         ASSERT(iterationCount >= 0);
         ASSERT(std::isnan(iterationDuration) || iterationDuration >= 0);
         ASSERT(std::isfinite(playbackRate));
         ASSERT(timingFunction);
     }
 
     double startDelay;
     double endDelay;
     FillMode fillMode;
     double iterationStart;
     double iterationCount;
     double iterationDuration;
     // FIXME: Add activeDuration.
     double playbackRate;
     PlaybackDirection direction;
     RefPtr<TimingFunction> timingFunction;
 };
 
 } // namespace WebCore
 
 #endif