Web Animations: Reduce duplication of Timing defaults.

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 35 matching lines @@
         FillModeBoth
     };
 
     enum PlaybackDirection {
         PlaybackDirectionNormal,
         PlaybackDirectionReverse,
         PlaybackDirectionAlternate,
         PlaybackDirectionAlternateReverse
     };
 
+    static const Timing& defaults()
+    {
+        DEFINE_STATIC_LOCAL(Timing, timing, ());
+        return timing;
+    }
+
     Timing()
         : startDelay(0)
         , endDelay(0)
         , fillMode(FillModeAuto)
         , iterationStart(0)
         , iterationCount(1)
         , iterationDuration(std::numeric_limits<double>::quiet_NaN())
         , playbackRate(1)
         , direction(PlaybackDirectionNormal)
         , timingFunction(LinearTimingFunction::create())
@@ skipping 20 matching lines @@
     double iterationDuration;
     // FIXME: Add activeDuration.
     double playbackRate;
     PlaybackDirection direction;
     RefPtr<TimingFunction> timingFunction;
 };
 
 } // namespace WebCore
 
 #endif