[test] Initial import of an emscripten test suite.

tools/presubmit.py

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. 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 307 matching lines @@
     for ext in SourceProcessor.RELEVANT_EXTENSIONS:
       if name.endswith(ext):
         return True
     return False
 
   def GetPathsToSearch(self):
     return ['.']
 
   def IgnoreDir(self, name):
     return (super(SourceProcessor, self).IgnoreDir(name) or
-            name in ('third_party', 'gyp', 'out', 'obj', 'DerivedSources'))
+            name in ('third_party', 'gyp', 'out', 'obj', 'DerivedSources',
+                     'emscripten'))
 
   IGNORE_COPYRIGHTS = ['box2d.js',
                        'cpplint.py',
                        'copy.js',
                        'corrections.js',
                        'crypto.js',
                        'daemon.py',
                        'earley-boyer.js',
                        'fannkuch.js',
                        'fasta.js',
@@ skipping 149 matching lines @@
   success = CheckRuntimeVsNativesNameClashes(workspace) and success
   success = CheckExternalReferenceRegistration(workspace) and success
   if success:
     return 0
   else:
     return 1
 
 
 if __name__ == '__main__':
   sys.exit(Main())