Add depfile support to android build scripts

build/android/gyp/jar_toc.py

 #!/usr/bin/env python
 #
 # Copyright 2013 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.
 
 """Creates a TOC file from a Java jar.
 
 The TOC file contains the non-package API of the jar. This includes all
 public/protected/package classes/functions/members and the values of static
@@ skipping 74 matching lines @@
   md5_check.CallAndRecordIfStale(
       lambda: UpdateToc(jar_path, toc_path),
       record_path=record_path,
       input_paths=[jar_path],
       )
   build_utils.Touch(toc_path)
 
 
 def main():
   parser = optparse.OptionParser()
+  build_utils.AddDepfileOption(parser)
+
   parser.add_option('--jar-path', help='Input .jar path.')
   parser.add_option('--toc-path', help='Output .jar.TOC path.')
   parser.add_option('--stamp', help='Path to touch on success.')
 
   options, _ = parser.parse_args()
 
   DoJarToc(options)
 
+  if options.depfile:
+    build_utils.WriteDepfile(
+        options.depfile,
+        build_utils.GetPythonDependencies())
+
   if options.stamp:
     build_utils.Touch(options.stamp)
 
 
 if __name__ == '__main__':
   sys.exit(main())