Add TypeChecking=Unrestricted to Web Animation APIs

Source/core/animation/AnimationPlayer.idl

Index: Source/core/animation/AnimationPlayer.idl
diff --git a/Source/core/animation/AnimationPlayer.idl b/Source/core/animation/AnimationPlayer.idl
index 4a23a1117824e597fd6ed6ca10d0ba603d96d8c1..8d1946d97b164e4f7fd20d97cae1fa793c3305e0 100644
--- a/Source/core/animation/AnimationPlayer.idl
+++ b/Source/core/animation/AnimationPlayer.idl
@@ -31,8 +31,9 @@
 enum AnimationPlayState { "idle", "pending", "running", "paused", "finished" };
 
 [
-    NoInterfaceObject,
     ActiveDOMObject,
+    NoInterfaceObject,
+    TypeChecking=Unrestricted,

[dstockwell, 2015/02/19 01:10:45]

There are checks in cpp which can be removed.

eg. In AnimationPlayer::setStartTime

    if (!std::isfinite(startTime))
        return;

[fs, 2015/02/19 10:24:33]

Done.

Looks like TimingInput could eventually get cleaned up the same way, but that
will require updating the Element.animate and Animation-constructor (maybe
more?) signatures first to be slightly stricter. So best left for another CL...

 ] interface AnimationPlayer : EventTarget {
     [RuntimeEnabled=WebAnimationsAPI] attribute AnimationNode? source;
     attribute double?    startTime;