Moving scripts to download and build apprtc/collider.

webrtc/tools/testing/download_golang.py

Index: webrtc/tools/testing/download_golang.py
diff --git a/webrtc/tools/testing/download_golang.py b/webrtc/tools/testing/download_golang.py
new file mode 100755
index 0000000000000000000000000000000000000000..8ceb4b44a9a211ce847f2070370b8342eae674fa
--- /dev/null
+++ b/webrtc/tools/testing/download_golang.py
@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+# Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+"""Downloads the golang SDK from WebRTC storage and unpacks it.
+
+Requires that depot_tools is installed and in the PATH.
+
+The precondition is that a directory 'golang' lives in the same directory
+as the script.
+This 'golang' directory has the following structure:
+
+/golang
+ |
+ |-----/linux/go.tar.gz.sha1
+ |-----/win/go.zip.sha1
+ |-----/mac/go.tar.gz.sha1
+"""
+
+import os
+import sys
+
+import utils
+
+
+SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
+
+
+def _GetGoArchivePathForPlatform():
+  archive_extension = 'zip' if utils.GetPlatform() == 'win' else 'tar.gz'
+  return os.path.join(utils.GetPlatform(), 'go.%s' % archive_extension)
+
+
+def main(argv):
+  if len(argv) == 1:
+    return 'Usage: %s <output_dir>' % argv[0]
+
+  output_dir = os.path.join(argv[1])
+  golang_path = os.path.join(SCRIPT_DIR, 'golang')
+  archive_path = os.path.join(golang_path, _GetGoArchivePathForPlatform())
+  old_archive_sha1 = utils.ComputeSHA1(archive_path)
+
+  utils.DownloadFilesFromGoogleStorage(golang_path)
+
+  if (old_archive_sha1 != utils.ComputeSHA1(archive_path)
+      or not os.path.exists('go')):
+    utils.DeleteDir(output_dir, 'go')
+    utils.UnpackArchiveTo(archive_path, output_dir)
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))