Web Animations CSS: Start running animations on the compositor

Source/core/animation/TimedItem.h

Index: Source/core/animation/TimedItem.h
diff --git a/Source/core/animation/TimedItem.h b/Source/core/animation/TimedItem.h
index 9719dcc3cf51ed69d0825d23d607715e3f6bfc76..ae95014500fbe57888b598918e3450e6d29a5f69 100644
--- a/Source/core/animation/TimedItem.h
+++ b/Source/core/animation/TimedItem.h
@@ -70,20 +70,20 @@ public:
 
     virtual ~TimedItem() { }
 
+    virtual bool isAnimation() const { return false; }
+
     Phase phase() const { return ensureCalculated().phase; }
     bool isCurrent() const { return ensureCalculated().isCurrent; }
     bool isInEffect() const { return ensureCalculated().isInEffect; }
     bool isInPlay() const { return ensureCalculated().isInPlay; }
     double timeToEffectChange() const { return ensureCalculated().timeToEffectChange; }
 
-    double startTime() const { return m_startTime; }
-
     double currentIteration() const { return ensureCalculated().currentIteration; }
     double activeDuration() const { return ensureCalculated().activeDuration; }
     double timeFraction() const { return ensureCalculated().timeFraction; }
+    double startTime() const { return m_startTime; }
     const Player* player() const { return m_player; }
     Player* player() { return m_player; }
-
     const Timing& specified() const { return m_specified; }
 
 protected: