Add a snapshot of flutter/engine/src/build to our sdk

build/download_sdk_extras.py

Index: build/download_sdk_extras.py
diff --git a/build/download_sdk_extras.py b/build/download_sdk_extras.py
new file mode 100755
index 0000000000000000000000000000000000000000..d7c5d6cad6c9eec10690644bf7ba485189e3f287
--- /dev/null
+++ b/build/download_sdk_extras.py
@@ -0,0 +1,71 @@
+#!/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__))
+CHROME_SRC = os.path.abspath(os.path.join(SCRIPT_DIR, os.pardir))
+sys.path.insert(0, os.path.join(SCRIPT_DIR, 'android'))
+sys.path.insert(1, os.path.join(CHROME_SRC, 'tools'))
+
+from pylib import constants
+import find_depot_tools
+
+DEPOT_PATH = find_depot_tools.add_depot_tools_to_path()
+GSUTIL_PATH = os.path.join(DEPOT_PATH, 'gsutil.py')
+SDK_EXTRAS_BUCKET = 'gs://chrome-sdk-extras'
+SDK_EXTRAS_PATH = os.path.join(constants.ANDROID_SDK_ROOT, 'extras')
+SDK_EXTRAS_JSON_FILE = os.path.join(os.path.dirname(__file__),
+                                    'android_sdk_extras.json')
+
+
+def clean_and_extract(dir_name, package_name, zip_file):
+  local_dir = '%s/%s/%s' % (SDK_EXTRAS_PATH, dir_name, package_name)
+  if os.path.exists(local_dir):
+    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
+  # 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'])
+      try:
+        subprocess.check_call(['python', GSUTIL_PATH, '--force-version', '4.7',
+                               'cp', package_zip, local_zip])
+      except subprocess.CalledProcessError:
+        print ('WARNING: Failed to download SDK packages. If this bot compiles '
+               'for Android, it may have errors.')
+        return 0
+    # 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())