[Android] Add gyp support for multidex.

build/android/gyp/main_dex_list.py

Index: build/android/gyp/main_dex_list.py
diff --git a/build/android/gyp/main_dex_list.py b/build/android/gyp/main_dex_list.py
new file mode 100755
index 0000000000000000000000000000000000000000..64420019eb905f6e5318837e32ad95ca908ddd83
--- /dev/null
+++ b/build/android/gyp/main_dex_list.py
@@ -0,0 +1,84 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 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 sys
+import tempfile
+
+from util import build_utils
+
+sys.path.append(os.path.abspath(os.path.join(
+    os.path.dirname(__file__), os.pardir)))
+from pylib import constants
+
+
+def main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument('--android-sdk-tools', required=True,
+                      help='Android sdk build tools directory.')
+  parser.add_argument('--main-dex-rules-path', action='append', default=[],
+                      dest='main_dex_rules_paths',
+                      help='A file containing a list of proguard rules to use '
+                           'in determining the class to include in the '
+                           'main dex.')
+  parser.add_argument('--main-dex-list-path', required=True,
+                      help='The main dex list file to generate.')
+  parser.add_argument('paths', nargs='+',
+                      help='JARs for which a main dex list should be '
+                           'generated.')
+
+  args = parser.parse_args()
+
+  with open(args.main_dex_list_path, 'w') as main_dex_list_file:
+
+    shrinked_android_jar = os.path.abspath(
+        os.path.join(args.android_sdk_tools, 'lib', 'shrinkedAndroid.jar'))
+    dx_jar = os.path.abspath(
+        os.path.join(args.android_sdk_tools, 'lib', 'dx.jar'))
+    paths_arg = ':'.join(args.paths)
+    rules_file = os.path.abspath(
+        os.path.join(args.android_sdk_tools, 'mainDexClasses.rules'))
+
+    with tempfile.NamedTemporaryFile(suffix='.jar') as temp_jar:
+      proguard_cmd = [
+        constants.PROGUARD_SCRIPT_PATH,
+        '-forceprocessing',
+        '-dontwarn', '-dontoptimize', '-dontobfuscate', '-dontpreverify',
+        '-injars', paths_arg,
+        '-outjars', temp_jar.name,
+        '-libraryjars', shrinked_android_jar,
+        '-include', rules_file,
+      ]
+      for m in args.main_dex_rules_paths:
+        proguard_cmd.extend(['-include', m])
+
+      main_dex_list = ''
+      try:
+        build_utils.CheckOutput(proguard_cmd)
+
+        java_cmd = [
+          'java', '-cp', dx_jar,
+          'com.android.multidex.MainDexListBuilder',
+          temp_jar.name, paths_arg
+        ]
+        main_dex_list = build_utils.CheckOutput(java_cmd)
+      except build_utils.CalledProcessError as e:
+        if 'output jar is empty' in e.output:
+          pass
+        elif "input doesn't contain any classes" in e.output:
+          pass
+        else:
+          raise
+
+      main_dex_list_file.write(main_dex_list)
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())
+