Update IDL to 1847

core/animation/ElementAnimation.idl

Index: core/animation/ElementAnimation.idl
diff --git a/core/animation/ElementAnimation.idl b/core/animation/ElementAnimation.idl
index e191d950bc02e025aac90ab22382d9a37232258a..e5c5137854939fac5adad3b4820e86d63dd63989 100644
--- a/core/animation/ElementAnimation.idl
+++ b/core/animation/ElementAnimation.idl
@@ -28,6 +28,10 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-partial interface Element {
-    [RuntimeEnabled=WebAnimationsAPI] void animate(sequence<Dictionary> keyframes, optional double duration);
-};
+[
+    RuntimeEnabled=WebAnimationsAPI,
+] partial interface Element {
+    Animation animate(sequence<Dictionary> keyframes, Dictionary timingInput);
+    Animation animate(sequence<Dictionary> keyframes, double timingInput);
+    Animation animate(sequence<Dictionary> keyframes);
+};