Add ChromeShellTestApk and other chrome/ test stuff

build/android/gyp/find.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.
 
 """Finds files in directories.
 """
 
 import fnmatch
 import optparse
 import os
 import sys
 
 
 def main(argv):
   parser = optparse.OptionParser()
   parser.add_option('--pattern', default='*', help='File pattern to match.')
   options, directories = parser.parse_args(argv)
 
   for d in directories:
+    if not os.path.exists(d):
+      print >> sys.stderr, '%s does not exist' % d
+      return 1
     for root, _, filenames in os.walk(d):
       for f in fnmatch.filter(filenames, options.pattern):
         print os.path.join(root, f)
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))