Update animation when changes in animation keyframes are detected.

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 75 matching lines @@
         ASSERT(std::isnan(iterationDuration) || iterationDuration >= 0);
         ASSERT(std::isfinite(playbackRate));
         ASSERT(timingFunction);
     }
 
     bool operator==(const Timing &other) const
     {
         return startDelay == other.startDelay && endDelay == other.endDelay
             && fillMode == other.fillMode && iterationStart == other.iterationStart
             && iterationCount == other.iterationCount && iterationDuration == other.iterationDuration
-            && playbackRate == other.playbackRate && direction == other.direction;
+            && playbackRate == other.playbackRate && direction == other.direction
+            && timingFunction == other.timingFunction;
     }
 
     bool operator!=(const Timing &other) const
     {
         return !(*this == other);
     }
 
     double startDelay;
     double endDelay;
     FillMode fillMode;
     double iterationStart;
     double iterationCount;
     double iterationDuration;
     double playbackRate;
     PlaybackDirection direction;
     RefPtr<TimingFunction> timingFunction;
 };
 
 } // namespace blink
 
 #endif