| Index: Source/core/animation/Timeline.idl | 
| diff --git a/Source/core/animation/Timeline.idl b/Source/core/animation/Timeline.idl | 
| index e101c79005cde6a01a95e486b9724eeaf478fa95..aa21c1889bd26ec94462ad6d48a4f68fa6286c6a 100644 | 
| --- a/Source/core/animation/Timeline.idl | 
| +++ b/Source/core/animation/Timeline.idl | 
| @@ -5,6 +5,7 @@ | 
| [ | 
| RuntimeEnabled=WebAnimationsAPI, | 
| ImplementedAs=DocumentTimeline, | 
| +    WillBeGarbageCollected, | 
| ] interface Timeline { | 
| readonly attribute double? currentTime; | 
| AnimationPlayer play(TimedItem source); | 
|  |