Animations: Make perf tests for web animations animate properly.

PerformanceTests/Animation/api-set-current-time-balls-keyframe-animations.html

Index: PerformanceTests/Animation/api-set-current-time-balls-keyframe-animations.html
diff --git a/PerformanceTests/Animation/api-set-current-time-balls-keyframe-animations.html b/PerformanceTests/Animation/api-set-current-time-balls-keyframe-animations.html
index 51de1df0c8c42b1f4bd6682728f012902d1851d6..d98c6e3c5aa1bdbc22c683fc59d50736879d59ab 100644
--- a/PerformanceTests/Animation/api-set-current-time-balls-keyframe-animations.html
+++ b/PerformanceTests/Animation/api-set-current-time-balls-keyframe-animations.html
@@ -132,8 +132,6 @@ function generateParticleKeyframes(index) {
         }
         allParticleKeyframes[index].push(generateKeyframe(t, x, y));
     }
-
-    return keyframes;
 }
 
 function generateKeyframe(t, x, y) {
@@ -150,7 +148,7 @@ function Particle(index)
     domNode.style.backgroundColor = colors[Math.floor(Math.random() * colors.length)];
 
     function start() {
-        var player = domNode.animate(allParticleKeyframes[index], {easing: "linear", iterations: Infinity, direction: "alternate", duration: animationDuration});
+        var player = domNode.animate(allParticleKeyframes[index], {easing: "linear", iterations: Infinity, direction: "alternate", duration: animationDuration * 1000});
         player.pause();
         this.player = player;
     }
@@ -171,7 +169,7 @@ function advance(timestamp)
     if (start == null)
         start = timestamp;
     for (var x in particles) {
-        particles[x].player.currentTime = (timestamp - start) / 1000;
+        particles[x].player.currentTime = timestamp - start;
     }
     if (particles.length !== 0)
         requestAnimationFrame(advance);