Web Animations: Throw exceptions for play/pause/reverse/finish with infinite end time

third_party/WebKit/Source/core/animation/Animation.idl

Index: third_party/WebKit/Source/core/animation/Animation.idl
diff --git a/third_party/WebKit/Source/core/animation/Animation.idl b/third_party/WebKit/Source/core/animation/Animation.idl
index 3e8c75847423ffb9b0249a2110105141d1280ede..39c15efcaa4bb4d162f9f7216ac7462bcc491656 100644
--- a/third_party/WebKit/Source/core/animation/Animation.idl
+++ b/third_party/WebKit/Source/core/animation/Animation.idl
@@ -43,11 +43,10 @@ enum AnimationPlayState { "idle", "pending", "running", "paused", "finished" };
     [Measure] attribute double     playbackRate;
     [Measure] readonly attribute AnimationPlayState playState;
     [Measure, RaisesException] void finish();
-    [Measure] void play();
-    [Measure] void pause();
-    [Measure] void reverse();
+    [Measure, RaisesException] void play();
+    [Measure, RaisesException] void pause();
+    [Measure, RaisesException] void reverse();
     [Measure] attribute DOMString id;
-
     [Measure] void cancel();
     [Measure] attribute EventHandler onfinish;
     [Measure] attribute EventHandler oncancel;