Plumb timeToNextEffect through players and animation

Source/core/animation/TimedItem.cpp

Index: Source/core/animation/TimedItem.cpp
diff --git a/Source/core/animation/TimedItem.cpp b/Source/core/animation/TimedItem.cpp
index 1ef24520016b71953899026b4b5c3b69a5e0dca2..8e7056d57f76436dfd5855d69dd4eff5009ead8c 100644
--- a/Source/core/animation/TimedItem.cpp
+++ b/Source/core/animation/TimedItem.cpp
@@ -100,6 +100,8 @@ void TimedItem::updateInheritedTime(double inheritedTime) const
     m_calculated.isInPlay = phase() == PhaseActive && (!m_parent || m_parent->isInPlay());
     m_calculated.isCurrent = phase() == PhaseBefore || isInPlay() || (m_parent && m_parent->isCurrent());
 
+    m_calculated.timeToEffectChange = calculateTimeToEffectChange(localTime, m_startTime + m_specified.startDelay, m_calculated.phase);
+
     // This logic is specific to CSS animation events and assumes that all
     // animations start after the DocumentTimeline has started.
     if (m_eventDelegate && (m_isFirstSample || previousPhase != phase() || (phase() == PhaseActive && previousIteration != currentIteration)))