Roll 50: Copied IDLs, PYTHON scripts from WebKit removed deleted files in WebCore

core/animation/KeyframeEffect.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 14 matching lines @@
  * 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.
  */
 
 // https://w3c.github.io/web-animations/#the-keyframeeffect-interfaces
 
 [
     // TODO(dstockwell): the third argument should be "optional (unrestricted double or KeyframeEffectOptions) timing".
-    Constructor(Element? target, sequence<Dictionary> keyframes, optional unrestricted double timing),
-    Constructor(Element? target, sequence<Dictionary> keyframes, KeyframeEffectOptions timing),
+    Constructor(Element? target, (EffectModel or sequence<Dictionary> or Dictionary)? effect, optional unrestricted double timing),
+    Constructor(Element? target, (EffectModel or sequence<Dictionary> or Dictionary)? effect, KeyframeEffectOptions timing),
     RaisesException=Constructor,
     RuntimeEnabled=WebAnimationsAPI,
-    TypeChecking=Interface,
 ] interface KeyframeEffect : AnimationEffectReadOnly {
 };