[Android] With gyp_managed_install no device is only a warning

build/android/gyp/apk_install.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.
 
 """Installs an APK.
 
 """
 
@@ skipping 38 matching lines @@
   """Records the metadata from the device for apk_package."""
   metadata = GetMetadata(apk_package)
   if not metadata:
     raise 'APK install failed unexpectedly.'
 
   with open(metadata_path, 'w') as outfile:
     outfile.write(metadata)
 
 
 def main(argv):
+  if not build_utils.IsDeviceReady():
+    build_utils.PrintBigWarning(
+        'Zero (or multiple) devices attached. Skipping APK install.')
+    return
+
   parser = optparse.OptionParser()
   parser.add_option('--android-sdk-tools',
       help='Path to Android SDK tools.')
   parser.add_option('--apk-path',
       help='Path to .apk to install.')
   parser.add_option('--install-record',
       help='Path to install record (touched only when APK is installed).')
   parser.add_option('--stamp',
       help='Path to touch on success.')
   options, _ = parser.parse_args()
@@ skipping 26 matching lines @@
       input_paths=[options.apk_path],
       input_strings=install_cmd,
       force=force_install)
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))