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

core/frame/ImageBitmap.idl

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // https://html.spec.whatwg.org/#images
 
 [
-    // TODO(philipj): Exposed=(Window,Worker)
+    Exposed=(Window,Worker),
     WillBeGarbageCollected,
 ] interface ImageBitmap {
-    // TODO(philipj): width/height should be unsigned long.
-    readonly attribute long width;
-    readonly attribute long height;
+    readonly attribute unsigned long width;
+    readonly attribute unsigned long height;
+    [RuntimeEnabled=ExperimentalCanvasFeatures] void close();
 };