[Android] With gyp_managed_install no device is only a warning

build/android/gyp/push_libraries.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.
 
 """Pushes native libraries to a device.
 
 """
 
@@ skipping 30 matching lines @@
 
     record_path = '%s.%s.push.md5.stamp' % (host_path, serial_number)
     md5_check.CallAndRecordIfStale(
         Push,
         record_path=record_path,
         input_paths=[host_path],
         input_strings=[device_path])
 
 
 def main(argv):
+  if not build_utils.IsDeviceReady():
+    build_utils.PrintBigWarning(
+        'Zero (or multiple) devices attached. Skipping native library push.')
+    return
+
   parser = optparse.OptionParser()
   parser.add_option('--libraries-dir',
       help='Directory that contains stripped libraries.')
   parser.add_option('--device-dir',
       help='Device directory to push the libraries to.')
   parser.add_option('--libraries-json',
       help='Path to the json list of native libraries.')
   parser.add_option('--stamp', help='Path to touch on success.')
   options, _ = parser.parse_args()
 
   required_options = ['libraries_dir', 'device_dir', 'libraries_json']
   build_utils.CheckOptions(options, parser, required=required_options)
 
   DoPush(options)
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))