Plumb timeToNextEffect through players and animation

Source/core/animation/Player.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 66 matching lines @@
 double Player::timeDrift() const
 {
     return paused() ? pausedTimeDrift() : m_timeDrift;
 }
 
 double Player::currentTime() const
 {
     return currentTimeBeforeDrift() - timeDrift();
 }
 
-bool Player::update()
+bool Player::update(double* timeToEffectChange)
 {
-    if (!m_content)
+    if (!m_content) {
+        if (timeToEffectChange)
+            *timeToEffectChange = std::numeric_limits<double>::infinity();
         return false;
+    }
 
     double newTime = isNull(m_timeline->currentTime()) ? nullValue() : currentTime();
     m_content->updateInheritedTime(newTime);
+    if (timeToEffectChange)
+        *timeToEffectChange = m_content->timeToEffectChange();
     return m_content->isCurrent() || m_content->isInEffect();
 }
 
 void Player::cancel()
 {
     if (!m_content)
         return;
 
     ASSERT(m_content->player() == this);
     m_content->detach();
@@ skipping 24 matching lines @@
 }
 
 void Player::setPlaybackRate(double newRate)
 {
     double previousTime = currentTime();
     m_playbackRate = newRate;
     setCurrentTime(previousTime);
 }
 
 } // namespace