File API: Add a use counter for nonstandard 'endings' option

third_party/WebKit/Source/core/fileapi/File.idl

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * (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/FileAPI/#file
 
 [
     // TODO(jsbell): fileName parameter has [EnsureUTF16] in the spec; use
     // USVString? https://github.com/w3c/FileAPI/issues/9
     Constructor(sequence<(Blob or DOMString or ArrayBufferView or ArrayBuffer)> fileBits, DOMString fileName, optional FilePropertyBag options),
+    ConstructorCallWith=ExecutionContext,
     RaisesException=Constructor,
     Exposed=(Window,Worker),
 ] interface File : Blob {
     readonly attribute DOMString name;
     readonly attribute long long lastModified;
 
     // Non-standard APIs
     [MeasureAs=FileGetLastModifiedDate] readonly attribute Date lastModifiedDate;
     [MeasureAs=PrefixedFileRelativePath] readonly attribute DOMString webkitRelativePath;
 };