The order of the generated supplemental code is not guaranteed

Source/bindings/scripts/generate-bindings.pl

 #!/usr/bin/perl -w
 #
 # Copyright (C) 2005 Apple Computer, Inc.
 # Copyright (C) 2006 Anders Carlsson <andersca@mac.com>
 # 
 # This file is part of WebKit
 # 
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Library General Public
 # License as published by the Free Software Foundation; either
@@ skipping 79 matching lines @@
     # ...
     #
     # The above indicates that Window.idl is supplemented by P.idl, Q.idl and R.idl,
     # Document.idl is supplemented by S.idl, and Event.idl is supplemented by no IDLs.
     # The IDL that supplements another IDL (e.g. P.idl) never appears in the dependency file.
     open FH, "< $supplementalDependencyFile" or die "Cannot open $supplementalDependencyFile\n";
     while (my $line = <FH>) {
         my ($idlFile, @followingIdlFiles) = split(/\s+/, $line);
         if ($idlFile and basename($idlFile) eq basename($targetIdlFile)) {
             $idlFound = 1;
-            @supplementedIdlFiles = @followingIdlFiles;
+            # We sort the supplemental IDL files so that the corresponding code is generated
+            # in a consistent order. This is important for the bindings tests.
+            @supplementedIdlFiles = sort @followingIdlFiles;
         }
     }
     close FH;
 
     # $additionalIdlFiles is list of IDL files which should not be included in
     # DerivedSources*.cpp (i.e. they are not described in the supplemental
     # dependency file) but should generate .h and .cpp files.
     if (!$idlFound and $additionalIdlFiles) {
         my @idlFiles = shellwords($additionalIdlFiles);
         $idlFound = grep { $_ and basename($_) eq basename($targetIdlFile) } @idlFiles;
@@ skipping 193 matching lines @@
                 last OUTER;
             }
         }
     }
     if ($error) {
         die "IDL ATTRIBUTE CHECKER ERROR: $error
 If you want to add a new IDL attribute, you need to add it to bindings/scripts/IDLAttributes.txt and add explanations to the Blink IDL document (http://chromium.org/blink/webidl).
 ";
     }
 }