Add depfile support to android build scripts

build/android/gn/zip.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.
 
 """Archives a set of files.
 """
 
 import ast
 import optparse
 import os
 import sys
 import zipfile
 
+sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, 'gyp'))
+from util import build_utils
+
 def DoZip(inputs, output, base_dir):
   with zipfile.ZipFile(output, 'w') as outfile:
     for f in inputs:
       outfile.write(f, os.path.relpath(f, base_dir))
 
 def main():
   parser = optparse.OptionParser()
+  build_utils.AddDepfileOption(parser)
+
   parser.add_option('--inputs', help='List of files to archive.')
   parser.add_option('--output', help='Path to output archive.')
   parser.add_option('--base-dir',
                     help='If provided, the paths in the archive will be '
                     'relative to this directory', default='.')
 
   options, _ = parser.parse_args()
 
   inputs = ast.literal_eval(options.inputs)
   output = options.output
   base_dir = options.base_dir
 
   DoZip(inputs, output, base_dir)
 
+  if options.depfile:
+    build_utils.WriteDepfile(
+        options.depfile,
+        build_utils.GetPythonDependencies())
+
 
 if __name__ == '__main__':
   sys.exit(main())