Web Animations: Handle iteration values which overflow int.

Source/core/animation/KeyframeEffect.cpp

 /*
  * 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 159 matching lines @@
     ASSERT(animation());
     if (!m_target || !m_model)
         return;
 
     if (hasIncompatibleStyle())
         animation()->cancelAnimationOnCompositor();
 
     double iteration = currentIteration();
     ASSERT(iteration >= 0);
     OwnPtr<Vector<RefPtr<Interpolation>>> interpolations = m_sampledEffect ? m_sampledEffect->mutableInterpolations() : nullptr;
-    // FIXME: Handle iteration values which overflow int.
-    bool changed = m_model->sample(static_cast<int>(iteration), timeFraction(), iterationDuration(), interpolations);
+    bool changed = m_model->sample(clampTo<int>(iteration, 0), timeFraction(), iterationDuration(), interpolations);
     if (m_sampledEffect) {
         m_sampledEffect->setInterpolations(interpolations.release());
     } else if (interpolations && !interpolations->isEmpty()) {
         SampledEffect* sampledEffect = SampledEffect::create(this, interpolations.release());
         m_sampledEffect = sampledEffect;
         ensureAnimationStack(m_target).add(sampledEffect);
         changed = true;
     } else {
         return;
     }
@@ skipping 176 matching lines @@
 
 DEFINE_TRACE(KeyframeEffect)
 {
     visitor->trace(m_target);
     visitor->trace(m_model);
     visitor->trace(m_sampledEffect);
     AnimationEffect::trace(visitor);
 }
 
 } // namespace blink