[Cronet] Use gn desc deps to find third_party licenses.

components/cronet/tools/cr_cronet.py

 #!/usr/bin/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.
 
 """
 cr_cronet.py - cr - like helper tool for cronet developers
 """
 
 import argparse
@@ skipping 44 matching lines @@
                                'gn',
                                'sync',
                                'build',
                                'install',
                                'proguard',
                                'test',
                                'build-test',
                                'stack',
                                'debug',
                                'build-debug'])
+  parser.add_argument('-g', '--gn', action='store_true',
+                      help='use gn output directory suffix')
   parser.add_argument('-d', '--out_dir', action='store',
                       help='name of the build directory')
   parser.add_argument('-i', '--iphoneos', action='store_true',
                       help='build for physical iphone')
   parser.add_argument('-r', '--release', action='store_true',
                       help='use release configuration')
 
   options, extra_options_list = parser.parse_known_args()
   print options
   print extra_options_list
 
   is_os = (sys.platform == 'darwin')
   if is_os:
     target_os = 'ios'
     test_target = 'cronet_test'
+    gn_args = 'target_cpu = "x64" '
     out_dir_suffix = '-iphonesimulator'
     if options.iphoneos:
+      gn_args = 'target_cpu = "arm64" '
       out_dir_suffix = '-iphoneos'
   else:
     target_os = 'android'
     test_target = 'cronet_test_instrumentation_apk'
+    gn_args = 'use_errorprone_java_compiler=true '
     out_dir_suffix = ''
 
   gyp_defines = 'GYP_DEFINES="OS=' + target_os + ' enable_websockets=0 '+ \
       'disable_file_support=1 disable_ftp_support=1 '+ \
       'enable_errorprone=1 use_platform_icu_alternatives=1 ' + \
       'disable_brotli_filter=1"'
-  gn_args = 'target_os="' + target_os + '" enable_websockets=false '+ \
+  gn_args += 'target_os="' + target_os + '" enable_websockets=false '+ \
       'disable_file_support=true disable_ftp_support=true '+ \
-      'use_errorprone_java_compiler=true use_platform_icu_alternatives=true '+ \
+      'use_platform_icu_alternatives=true '+ \
       'disable_brotli_filter=true'
 
   extra_options = ' '.join(extra_options_list)
+  if options.gn:
+    out_dir_suffix += "-gn"
+
   if options.release:
     out_dir = 'out/Release' + out_dir_suffix
     release_arg = ' --release'
     gn_args += ' is_debug=false '
   else:
     out_dir = 'out/Debug' + out_dir_suffix
     release_arg = ''
 
   if options.out_dir:
     out_dir = options.out_dir
@@ skipping 28 matching lines @@
       return test_ios(out_dir, extra_options)
     if (options.command=='build-test'):
       return build(out_dir, test_target) or test_ios(out_dir, extra_options)
 
   parser.print_help()
   return 1
 
 
 if __name__ == '__main__':
   sys.exit(main())