Web Animations: Clip animation active intervals if endDelay is negative

third_party/WebKit/Source/core/animation/TimingCalculations.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 32 matching lines @@
     ASSERT(!isNull(x));
     ASSERT(!isNull(y));
     return x && y ? x * y : 0;
 }
 
 static inline AnimationEffect::Phase calculatePhase(double activeDuration, double localTime, const Timing& specified)
 {
     ASSERT(activeDuration >= 0);
     if (isNull(localTime))
         return AnimationEffect::PhaseNone;
-    if (localTime < specified.startDelay)
+    double endTime = specified.startDelay + activeDuration + specified.endDelay;
+    if (localTime < std::min(specified.startDelay, endTime))
         return AnimationEffect::PhaseBefore;
-    if (localTime >= specified.startDelay + activeDuration)
+    if (localTime >= std::min(specified.startDelay + activeDuration, endTime))
         return AnimationEffect::PhaseAfter;
     return AnimationEffect::PhaseActive;
 }
 
 static inline bool isActiveInParentPhase(AnimationEffect::Phase parentPhase, Timing::FillMode fillMode)
 {
     switch (parentPhase) {
     case AnimationEffect::PhaseBefore:
         return fillMode == Timing::FillModeBackwards || fillMode == Timing::FillModeBoth;
     case AnimationEffect::PhaseActive:
@@ skipping 130 matching lines @@
     if (!std::isfinite(iterationDuration))
         return directedTime;
     double timeFraction = directedTime / iterationDuration;
     ASSERT(timeFraction >= 0 && timeFraction <= 1);
     return multiplyZeroAlwaysGivesZero(iterationDuration, specified.timingFunction->evaluate(timeFraction, accuracyForDuration(iterationDuration)));
 }
 
 } // namespace blink
 
 #endif