Web Animations: Allow animations with delay to start on compositor

Source/core/animation/ActiveAnimations.cpp

Index: Source/core/animation/ActiveAnimations.cpp
diff --git a/Source/core/animation/ActiveAnimations.cpp b/Source/core/animation/ActiveAnimations.cpp
index 317722af295e12a085355f33bfe410d3fefb7cdf..0f530a0e8de3f096dc5734d57530da6d34dde770 100644
--- a/Source/core/animation/ActiveAnimations.cpp
+++ b/Source/core/animation/ActiveAnimations.cpp
@@ -77,7 +77,16 @@ bool hasActiveAnimationsOnCompositor(const RenderObject& renderer, CSSPropertyID
 
 bool ActiveAnimations::hasActiveAnimations(CSSPropertyID property) const
 {
-    return m_defaultStack.affects(property);
+    for (PlayerSet::const_iterator it = m_players.begin(); it != players().end(); ++it) {
+        const Player& player = *it->key;
+        ASSERT(player.source());
+        // FIXME: Needs to consider AnimationGroup once added.
+        ASSERT(player.source()->isAnimation());
+        const Animation& animation = *toAnimation(player.source());
+        if (animation.isCurrent() && animation.affects(property))
+            return true;
+    }
+    return false;
 }
 
 bool ActiveAnimations::hasActiveAnimationsOnCompositor(CSSPropertyID property) const