Fix crash in keyframe-effect/getComputedTiming tests

third_party/WebKit/Source/core/animation/AnimationEffect.cpp

Index: third_party/WebKit/Source/core/animation/AnimationEffect.cpp
diff --git a/third_party/WebKit/Source/core/animation/AnimationEffect.cpp b/third_party/WebKit/Source/core/animation/AnimationEffect.cpp
index 6d30f7753e341f8866eaee79525aa89bef7ec55c..6d2f567287a18b4d0e53490ef8d2a6001b801050 100644
--- a/third_party/WebKit/Source/core/animation/AnimationEffect.cpp
+++ b/third_party/WebKit/Source/core/animation/AnimationEffect.cpp
@@ -158,7 +158,11 @@ void AnimationEffect::updateInheritedTime(double inheritedTime, TimingUpdateReas
             const double iterationTime = calculateIterationTime(iterationDuration, repeatedDuration(), scaledActiveTime, startOffset, m_timing);
 
             currentIteration = calculateCurrentIteration(iterationDuration, iterationTime, scaledActiveTime, m_timing);
-            timeFraction = calculateTransformedTime(currentIteration, iterationDuration, iterationTime, m_timing) / iterationDuration;
+            const double transformedTime = calculateTransformedTime(currentIteration, iterationDuration, iterationTime, m_timing);
+            if (!std::isfinite(iterationDuration))

[alancutter (OOO until 2018), 2016/04/15 01:01:59]

Is there a spec bug we can link to given that this a work around a problem with
the spec?

+                timeFraction = fmod(m_timing.iterationStart, 1.0);
+            else
+                timeFraction = transformedTime / iterationDuration;
 
             if (!isNull(iterationTime)) {
                 timeToNextIteration = (iterationDuration - iterationTime) / std::abs(m_timing.playbackRate);