Add TypeChecking=Unrestricted to Web Animation APIs

Source/core/animation/AnimationPlayer.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 enum AnimationPlayState { "idle", "pending", "running", "paused", "finished" };
 
 [
+    ActiveDOMObject,
     NoInterfaceObject,
-    ActiveDOMObject,
+    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;
     attribute double?    currentTime;
     attribute double     playbackRate;
     [MeasureAs=AnimationPlayerGetPlayState] readonly attribute AnimationPlayState playState;
     [MeasureAs=AnimationPlayerFinish, RaisesException] void finish();
     [MeasureAs=AnimationPlayerPlay] void play();
     [MeasureAs=AnimationPlayerPause] void pause();
     [MeasureAs=AnimationPlayerReverse] void reverse();
 
     void cancel();
     [MeasureAs=AnimationPlayerFinishEvent] attribute EventHandler onfinish;
     [RuntimeEnabled=WebAnimationsAPI, CallWith=ScriptState] readonly attribute Promise<AnimationPlayer> finished;
     [RuntimeEnabled=WebAnimationsAPI, CallWith=ScriptState] readonly attribute Promise<AnimationPlayer> ready;
 };