Add a script for creating the iOS SDK (#2655)

Hosting this script inside the repo will let us change the contents of the SDK
without having to synchronize a change on the infrastructure and in the repo.

sky/tools/create_ios_sdk.py

@@ -0,0 +1,60 @@
+#!/usr/bin/env python
+# Copyright 2016 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.
+
+import argparse
+import subprocess
+import shutil
+import sys
+import os
+
+
+def main():
+  parser = argparse.ArgumentParser(description='Creates the Flutter iOS SDK')
+
+  parser.add_argument('--dst', type=str, required=True)
+  args = parser.parse_args()
+
+  device_sdk = 'out/ios_Release/Flutter'
+  simulator_sdk = 'out/ios_sim_Release/Flutter'
+
+  device_dylib = 'out/ios_Release/Flutter.framework/Flutter'
+  simulator_dylib = 'out/ios_sim_Release/Flutter.framework/Flutter'
+
+  if not os.path.isdir(device_sdk):
+    print 'Cannot find iOS device SDK at', device_sdk
+    return 1
+
+  if not os.path.isdir(simulator_sdk):
+    print 'Cannot find iOS simulator SDK at', simulator_sdk
+    return 1
+
+  if not os.path.isfile(device_dylib):
+    print 'Cannot find iOS device dylib at', device_dylib
+    return 1
+
+  if not os.path.isfile(simulator_dylib):
+    print 'Cannot find iOS device dylib at', simulator_dylib
+    return 1
+
+  shutil.rmtree(args.dst, True)
+  shutil.copytree(device_sdk, args.dst)
+
+  sim_tools = 'Tools/iphonesimulator'
+  shutil.copytree(os.path.join(simulator_sdk, sim_tools),
+                  os.path.join(args.dst, sim_tools))
+
+  # TODO(abarth): Add once https://github.com/flutter/engine/pull/2654 lands.
+  # subprocess.call([
+  #   'lipo',
+  #   device_dylib,
+  #   simulator_dylib,
+  #   '-create',
+  #   '-output',
+  #   os.path.join(args.dst, 'Tools/common/Flutter.framework/Flutter')
+  # ])
+
+
+if __name__ == '__main__':
+  sys.exit(main())