Catch AccessDeniedException on bots without permission to download SDK extras.

build/download_sdk_extras.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.
 
 """Script to download sdk/extras packages on the bots from google storage.
 
 The script expects arguments that specify zips file in the google storage
 bucket named: <dir in SDK extras>_<package name>_<version>.zip. The file will
 be extracted in the android_tools/sdk/extras directory on the test bots. This
 script will not do anything for developers.
+
+TODO(navabi): Move this script (crbug.com/459819).
 """
 
 import json
 import os
 import shutil
 import subprocess
 import sys
 import zipfile
 
 SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))
@@ skipping 18 matching lines @@
     shutil.rmtree(local_dir)
   local_zip = '%s/%s' % (SDK_EXTRAS_PATH, zip_file)
   with zipfile.ZipFile(local_zip) as z:
     z.extractall(path=SDK_EXTRAS_PATH)
 
 
 def main():
   if not os.environ.get('CHROME_HEADLESS'):
     # This is not a buildbot checkout.
     return 0
+  elif 'OS=android' not in os.environ.get('GYP_DEFINES', ''):
+    # Not an Android buildbot.
+    return 0
   # Update the android_sdk_extras.json file to update downloaded packages.
   with open(SDK_EXTRAS_JSON_FILE) as json_file:
     packages = json.load(json_file)
   for package in packages:
     local_zip = '%s/%s' % (SDK_EXTRAS_PATH, package['zip'])
     if not os.path.exists(local_zip):
       package_zip = '%s/%s' % (SDK_EXTRAS_BUCKET, package['zip'])
       subprocess.check_call(['python', GSUTIL_PATH, '--force-version', '4.7',
                              'cp', package_zip, local_zip])
     # Always clean dir and extract zip to ensure correct contents.
     clean_and_extract(package['dir_name'], package['package'], package['zip'])
 
 
 if __name__ == '__main__':
   sys.exit(main())