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

core/animation/KeyframeEffect.idl

Index: core/animation/KeyframeEffect.idl
diff --git a/core/animation/KeyframeEffect.idl b/core/animation/KeyframeEffect.idl
index 0235507d149325283a9c79cc9ffcae328af77641..5ec493d3c526c484de459ef246ce03d645834cbe 100644
--- a/core/animation/KeyframeEffect.idl
+++ b/core/animation/KeyframeEffect.idl
@@ -32,10 +32,9 @@
 
 [
     // 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 {
 };