Update experimental Java 8 support to use Desugar instead of Retrolambda

build/android/gyp/desugar.py

Index: build/android/gyp/desugar.py
diff --git a/build/android/gyp/desugar.py b/build/android/gyp/desugar.py
new file mode 100755
index 0000000000000000000000000000000000000000..6455279d1ee53024e8b53842924936925ab24ee5
--- /dev/null
+++ b/build/android/gyp/desugar.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python
+#
+# Copyright 2017 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 os
+import shutil
+import sys
+import tempfile
+
+from util import build_utils
+
+
+_SRC_ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__),
+                                         '..', '..', '..'))
+_DESUGAR_JAR_PATH = os.path.normpath(os.path.join(
+    _SRC_ROOT, 'third_party', 'bazel', 'desugar', 'Desugar.jar'))
+
+
+def _OnStaleMd5(input_jar, output_jar, classpath, bootclasspath_entry):
+  cmd = [
+      'java',
+      '-jar',
+      _DESUGAR_JAR_PATH,
+      '--input',
+      input_jar,
+      '--bootclasspath_entry',
+      bootclasspath_entry,
+      '--output',
+      output_jar,
+      # Disable try-with-resources due to proguard duplicate zip entry error
+      # TODO(zpeng): Enable try-with-resources with
+      #    desugar_try_with_resources_omit_runtime_classes
+      '--desugar_try_with_resources_if_needed=false',
+  ]
+  for path in classpath:
+    cmd += ['--classpath_entry', path]
+  build_utils.CheckOutput(cmd, print_stdout=False)
+
+
+def main():
+  args = build_utils.ExpandFileArgs(sys.argv[1:])
+  parser = argparse.ArgumentParser()
+  build_utils.AddDepfileOption(parser)
+  parser.add_argument('--input-jar', required=True,
+                      help='Jar input path to include .class files from.')
+  parser.add_argument('--output-jar', required=True,
+                      help='Jar output path.')
+  parser.add_argument('--classpath', required=True,
+                      help='Classpath.')
+  parser.add_argument('--bootclasspath-entry', required=True,
+                      help='Path to javac bootclasspath interface jar.')
+  options = parser.parse_args(args)
+
+  options.classpath = build_utils.ParseGnList(options.classpath)
+  input_paths = options.classpath + [
+      options.bootclasspath_entry,
+      options.input_jar,
+  ]
+  output_paths = [options.output_jar]
+  depfile_deps = options.classpath + [_DESUGAR_JAR_PATH]
+
+  build_utils.CallAndWriteDepfileIfStale(
+      lambda: _OnStaleMd5(options.input_jar, options.output_jar,
+                          options.classpath, options.bootclasspath_entry),
+      options,
+      input_paths=input_paths,
+      input_strings=[],
+      output_paths=output_paths,
+      depfile_deps=depfile_deps)
+
+
+if __name__ == '__main__':
+  sys.exit(main())