Add option BIONIC toolchain to NaCl SDK output

native_client_sdk/src/build_tools/parse_dsc.py

 #!/usr/bin/env python
 # Copyright (c) 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 collections
 import fnmatch
 import optparse
 import os
 import sys
 
-VALID_TOOLCHAINS = ['newlib', 'glibc', 'pnacl', 'win', 'linux', 'mac']
+VALID_TOOLCHAINS = [
+  'bionic',
+  'newlib',
+  'glibc',
+  'pnacl',
+  'win',
+  'linux',
+  'mac',
+]
 
 # 'KEY' : ( <TYPE>, [Accepted Values], <Required?>)
 DSC_FORMAT = {
     'DISABLE': (bool, [True, False], False),
     'SEL_LDR': (bool, [True, False], False),
     # Disable this project from being included in the NaCl packaged app.
     'DISABLE_PACKAGE': (bool, [True, False], False),
     # Don't generate the additional files to allow this project to run as a
     # packaged app (i.e. manifest.json, background.js, etc.).
     'NO_PACKAGE_FILES': (bool, [True, False], False),
@@ skipping 239 matching lines @@
   except ValidationError as e:
     sys.stderr.write(str(e) + '\n')
     return 1
 
   PrintProjectTree(tree)
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))