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

build/protoc_java.py

Index: build/protoc_java.py
diff --git a/build/protoc_java.py b/build/protoc_java.py
new file mode 100755
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+++ b/build/protoc_java.py
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+#!/usr/bin/env python
+# Copyright (c) 2012 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.
+
+"""Generate java source files from protobuf files.
+
+This is a helper file for the genproto_java action in protoc_java.gypi.
+
+It performs the following steps:
+1. Deletes all old sources (ensures deleted classes are not part of new jars).
+2. Creates source directory.
+3. Generates Java files using protoc (output into either --java-out-dir or
+   --srcjar).
+4. Creates a new stamp file.
+"""
+
+import os
+import optparse
+import shutil
+import subprocess
+import sys
+
+sys.path.append(os.path.join(os.path.dirname(__file__), "android", "gyp"))
+from util import build_utils
+
+def main(argv):
+  parser = optparse.OptionParser()
+  build_utils.AddDepfileOption(parser)
+  parser.add_option("--protoc", help="Path to protoc binary.")
+  parser.add_option("--proto-path", help="Path to proto directory.")
+  parser.add_option("--java-out-dir",
+      help="Path to output directory for java files.")
+  parser.add_option("--srcjar", help="Path to output srcjar.")
+  parser.add_option("--stamp", help="File to touch on success.")
+  options, args = parser.parse_args(argv)
+
+  build_utils.CheckOptions(options, parser, ['protoc', 'proto_path'])
+  if not options.java_out_dir and not options.srcjar:
+    print 'One of --java-out-dir or --srcjar must be specified.'
+    return 1
+
+  with build_utils.TempDir() as temp_dir:
+    # Specify arguments to the generator.
+    generator_args = ['optional_field_style=reftypes',
+                      'store_unknown_fields=true']
+    out_arg = '--javanano_out=' + ','.join(generator_args) + ':' + temp_dir
+    # Generate Java files using protoc.
+    build_utils.CheckOutput(
+        [options.protoc, '--proto_path', options.proto_path, out_arg]
+        + args)
+
+    if options.java_out_dir:
+      build_utils.DeleteDirectory(options.java_out_dir)
+      shutil.copytree(temp_dir, options.java_out_dir)
+    else:
+      build_utils.ZipDir(options.srcjar, temp_dir)
+
+  if options.depfile:
+    build_utils.WriteDepfile(
+        options.depfile,
+        args + [options.protoc] + build_utils.GetPythonDependencies())
+
+  if options.stamp:
+    build_utils.Touch(options.stamp)
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))