Sync the ImageBitmapFactories interface with the spec

Source/core/imagebitmap/WindowImageBitmapFactories.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 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * 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
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  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+// https://html.spec.whatwg.org/#imagebitmapfactories
+
+// TODO(philipj): This should be part of the ImageBitmapFactories interface.
 [
     ImplementedAs=ImageBitmapFactories,
     RuntimeEnabled=ExperimentalCanvasFeatures,
     TypeChecking=Interface,
 ] partial interface Window {
     [CallWith=ScriptState, RaisesException] Promise createImageBitmap(HTMLImageElement image);
     [CallWith=ScriptState, RaisesException] Promise createImageBitmap(HTMLImageElement image, long sx, long sy, long sw, long sh);
     [CallWith=ScriptState, RaisesException] Promise createImageBitmap(HTMLVideoElement video);
     [CallWith=ScriptState, RaisesException] Promise createImageBitmap(HTMLVideoElement video, long sx, long sy, long sw, long sh);
     [CallWith=ScriptState, RaisesException] Promise createImageBitmap(CanvasRenderingContext2D context);
     [CallWith=ScriptState, RaisesException] Promise createImageBitmap(CanvasRenderingContext2D context, long sx, long sy, long sw, long sh);
     [CallWith=ScriptState, RaisesException] Promise createImageBitmap(HTMLCanvasElement canvas);
     [CallWith=ScriptState, RaisesException] Promise createImageBitmap(HTMLCanvasElement canvas, long sx, long sy, long sw, long sh);
 };