Make test apks only dex files not in tested apk

build/android/gyp/dex.py

 #!/usr/bin/env python
 #
 # Copyright 2013 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 optparse
 import os
 import sys
 
 from util import build_utils
 from util import md5_check
 
 
 def DoDex(options, paths):
   dx_binary = os.path.join(options.android_sdk_tools, 'dx')
   # See http://crbug.com/272064 for context on --force-jumbo.
   dex_cmd = [dx_binary, '--dex', '--force-jumbo', '--output', options.dex_path]
   if options.no_locals != '0':
     dex_cmd.append('--no-locals')
   dex_cmd += paths
 
   record_path = '%s.md5.stamp' % options.dex_path
   md5_check.CallAndRecordIfStale(
       lambda: build_utils.CheckOutput(dex_cmd, print_stderr=False),
       record_path=record_path,
       input_paths=paths,
-      input_strings=dex_cmd)
-
-  build_utils.Touch(options.dex_path)
+      input_strings=dex_cmd,
+      force=not os.path.exists(options.dex_path))
+  build_utils.WriteJson(paths, options.dex_path + '.inputs')
 
 
 def main():
   parser = optparse.OptionParser()
   parser.add_option('--android-sdk-tools',
                     help='Android sdk build tools directory.')
   parser.add_option('--dex-path', help='Dex output path.')
   parser.add_option('--configuration-name',
                     help='The build CONFIGURATION_NAME.')
   parser.add_option('--proguard-enabled',
                     help='"true" if proguard is enabled.')
   parser.add_option('--proguard-enabled-input-path',
                     help=('Path to dex in Release mode when proguard '
                           'is enabled.'))
   parser.add_option('--no-locals',
                     help='Exclude locals list from the dex file.')
+  parser.add_option('--excluded-paths-file',
+                    help='Path to a file containing a list of paths to exclude '
+                    'from the dex file.')
 
   options, paths = parser.parse_args()
 
   if (options.proguard_enabled == 'true'
       and options.configuration_name == 'Release'):
     paths = [options.proguard_enabled_input_path]
 
+  if options.excluded_paths_file:
+    exclude_paths = build_utils.ReadJson(options.excluded_paths_file)
+    paths = [p for p in paths if not p in exclude_paths]
+
   DoDex(options, paths)
 
 
 if __name__ == '__main__':
   sys.exit(main())