Enable saving the same file in multiple archives

scripts/common/archive_utils_unittest.py

 #!/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.
 
 import optparse
 import os
 import shutil
 import sys
 import tempfile
@@ skipping 369 matching lines @@
 
   def testOptionalFiles(self):
     files_cfg = CreateTestFilesCfg(self.temp_dir)
     optional_fn = 'allany_dev_optional.txt'
     arch = '64bit'
     buildtype = 'dev'
     fparser = archive_utils.FilesCfgParser(files_cfg, buildtype, arch)
     self.assertTrue(fparser.IsOptional(optional_fn))
     non_existent_fn = 'non_existent_fn.txt'
     self.assertFalse(fparser.IsOptional(non_existent_fn))
+    not_optional_fn = 'archive_allany.txt'
+    self.assertFalse(fparser.IsOptional(not_optional_fn))
 
     # It's only optional for 'dev' builds.
     buildtype = 'official'
     fparser = archive_utils.FilesCfgParser(files_cfg, buildtype, arch)
     self.assertFalse(fparser.IsOptional(optional_fn))
 
   def testDirectArchive(self):
     files_cfg = CreateTestFilesCfg(self.temp_dir)
     arch = '64bit'
     buildtype = 'dev'
@@ skipping 233 matching lines @@
         sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
         svn_client = pysvn.Client()
         DiffFilesCfg(RealFilesCfgTest.WIN_PATH, svn_client)
         DiffFilesCfg(RealFilesCfgTest.LINUX_PATH, svn_client)
         DiffFilesCfg(RealFilesCfgTest.MAC_PATH, svn_client)
         DiffFilesCfg(RealFilesCfgTest.CROS_PATH, svn_client)
 
   # Specify error return so caller (e.g. shell script) can easily detect
   # failures.
   sys.exit(errors)