Fix the ChromeVox generate_deps.py to create the parent dir for the output file.

chrome/browser/resources/chromeos/chromevox/tools/generate_deps.py

 #!/usr/bin/env python
 
 # Copyright 2014 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.
 
 ''' Generates a deps.js file based on an input list of javascript files using
 Closure style provide/require calls.
 '''
 
@@ skipping 24 matching lines @@
                           'The resulting path is used in the deps mapping ' +
                           'file path to a list of provided and required ' +
                           'namespaces.'))
   parser.add_option('-o', '--output_file', action='store', default=[],
                     metavar='SPEC',
                     help=('Where to output the generated deps file.'))
   options, args = parser.parse_args()
 
   path_rewriter = PathRewriter(options.prefix_map)
 
+  # Create the generated deps file's parent directory.
+  output_dir = os.path.dirname(os.path.abspath(options.output_file))
+  if not os.path.exists(output_dir):
+    os.makedirs(output_dir)
+
   # Write the generated deps file.
   with open(options.output_file, 'w') as output:
     for path in args:
       js_deps = source.Source(source.GetFileContents(path))
       path = path_rewriter.RewritePath(path)
       line = 'goog.addDependency(\'%s\', %s, %s);\n' % (
           path, sorted(js_deps.provides), sorted(js_deps.requires))
       output.write(line)
 
 
 if __name__ == '__main__':
   main()