Web Animations: Update naming to reflect spec changes

Source/core/animation/Animation.idl

Index: Source/core/animation/Animation.idl
diff --git a/Source/core/animation/Animation.idl b/Source/core/animation/Animation.idl
index 2da00b3bac00cb93fe8f2ab90e9bb0660c6eb868..cb339a2b03d9e2dc72fa0c1ac3f78f92e2544f67 100644
--- a/Source/core/animation/Animation.idl
+++ b/Source/core/animation/Animation.idl
@@ -28,18 +28,28 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-// http://www.w3.org/TR/web-animations/#the-animation-interface
+// https://w3c.github.io/web-animations/#animation
 
-// TODO(dstockwell): This interface has been renamed to KeyframeEffect in the
-// latest spec:
-// https://w3c.github.io/web-animations/#the-keyframeeffect-interfaces
+enum AnimationPlayState { "idle", "pending", "running", "paused", "finished" };
 
 [
-    // FIXME: the third argument should be "optional (unrestricted double or AnimationTimingProperties) timing".
-    Constructor(Element? target, sequence<Dictionary> keyframes, optional unrestricted double timing),
-    Constructor(Element? target, sequence<Dictionary> keyframes, AnimationTimingProperties timing),
-    RaisesException=Constructor,
-    RuntimeEnabled=WebAnimationsAPI,
-    TypeChecking=Interface,
-] interface Animation : AnimationNode {
+    ActiveDOMObject,
+    NoInterfaceObject,
+] interface Animation : EventTarget {
+    // TODO(dstockwell): Add timeline property.
+    // TODO(dstockwell): Rename source to effect.
+    [RuntimeEnabled=WebAnimationsAPI] attribute AnimationEffectReadOnly? source;
+    [Measure] attribute double?    startTime;
+    [Measure] attribute double?    currentTime;
+    [Measure] attribute double     playbackRate;
+    [Measure] readonly attribute AnimationPlayState playState;
+    [Measure, RaisesException] void finish();
+    [Measure] void play();
+    [Measure] void pause();
+    [Measure] void reverse();
+
+    [Measure] void cancel();
+    [Measure] attribute EventHandler onfinish;
+    [RuntimeEnabled=WebAnimationsAPI, CallWith=ScriptState] readonly attribute Promise<Animation> finished;
+    [RuntimeEnabled=WebAnimationsAPI, CallWith=ScriptState] readonly attribute Promise<Animation> ready;
 };