[Android] Enable multidex for debug builds of ChromePublic.

build/android/gyp/apk_obfuscate.py

 #!/usr/bin/env python
 #
 # Copyright 2014 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.
 
 """Generates the obfuscated jar and test jar for an apk.
 
 If proguard is not enabled or 'Release' is not in the configuration name,
 obfuscation will be a no-op.
 """
 
+import json
 import optparse
 import os
 import sys
+import tempfile
 
 from util import build_utils
 from util import proguard_util
 
 
+_PROGUARD_KEEP_CLASS = '''-keep class %s {
+  *;
+}
+'''
+
+
 def ParseArgs(argv):
   parser = optparse.OptionParser()
   parser.add_option('--android-sdk', help='path to the Android SDK folder')
   parser.add_option('--android-sdk-tools',
                     help='path to the Android SDK build tools folder')
   parser.add_option('--android-sdk-jar',
                     help='path to Android SDK\'s android.jar')
   parser.add_option('--proguard-jar-path',
                     help='Path to proguard.jar in the sdk')
   parser.add_option('--input-jars-paths',
@@ skipping 18 matching lines @@
   parser.add_option('--testapp', action='store_true',
                     help='Set this if building an instrumentation test apk')
   parser.add_option('--tested-apk-obfuscated-jar-path',
                     help='Path to obfusctated jar of the tested apk')
   parser.add_option('--test-jar-path',
                     help='Output path for jar containing all the test apk\'s '
                     'code.')
 
   parser.add_option('--stamp', help='File to touch on success')
 
+  parser.add_option('--main-dex-list-path',
+                    help='The list of classes to retain in the main dex. '
+                         'These will not be obfuscated.')
+  parser.add_option('--multidex-configuration-path',
+                    help='A JSON file containing multidex build configuration.')
+
   (options, args) = parser.parse_args(argv)
 
   if args:
     parser.error('No positional arguments should be given. ' + str(args))
 
   # Check that required options have been provided.
   required_options = (
       'android_sdk',
       'android_sdk_tools',
       'android_sdk_jar',
@@ skipping 22 matching lines @@
   configs = build_utils.ParseGypList(options.proguard_configs)
   if options.tested_apk_obfuscated_jar_path:
     # configs should only contain the process_resources.py generated config.
     assert len(configs) == 1, (
         'test apks should not have custom proguard configs: ' + str(configs))
     proguard.tested_apk_info(options.tested_apk_obfuscated_jar_path + '.info')
 
   proguard.libraryjars([options.android_sdk_jar])
   proguard_injars = [p for p in input_jars if p not in exclude_paths]
   proguard.injars(proguard_injars)
+
+  multidex_config = _PossibleMultidexConfig(options)
+  if multidex_config:
+    configs.append(multidex_config)
+
   proguard.configs(configs)
+  proguard.CheckOutput()
 
-  proguard.CheckOutput()
+
+def _PossibleMultidexConfig(options):
+  if not options.multidex_configuration_path:
+    return None
+
+  with open(options.multidex_configuration_path) as multidex_config_file:
+    multidex_config = json.loads(multidex_config_file.read())
+
+  if not (multidex_config.get('enabled') and options.main_dex_list_path):
+    return None
+
+  main_dex_list_config = ''
+  with open(options.main_dex_list_path) as main_dex_list:
+    for clazz in (l.strip() for l in main_dex_list):
+      if clazz.endswith('.class'):
+        clazz = clazz[:-len('.class')]
+      clazz = clazz.replace('/', '.')
+      main_dex_list_config += (_PROGUARD_KEEP_CLASS % clazz)
+  with tempfile.NamedTemporaryFile(
+      delete=False,
+      dir=os.path.dirname(options.main_dex_list_path),
+      prefix='main_dex_list_proguard',
+      suffix='.flags') as main_dex_config_file:
+    main_dex_config_file.write(main_dex_list_config)
+  return main_dex_config_file.name
 
 
 def main(argv):
   options, _ = ParseArgs(argv)
 
   input_jars = build_utils.ParseGypList(options.input_jars_paths)
 
   if options.testapp:
     dependency_class_filters = [
         '*R.class', '*R$*.class', '*Manifest.class', '*BuildConfig.class']
@@ skipping 15 matching lines @@
     for f in output_files:
       if os.path.exists(f):
         os.remove(f)
       build_utils.Touch(f)
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))