Allow mojo_debug gdb attach to search symbols in multiple directories.

mojo/devtools/common/mojo_debug

 #!/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.
 
 import argparse
 import codecs
 import logging
 import os.path
 import requests
@@ skipping 204 matching lines @@
       'arm-linux-androideabi-4.9',
       'prebuilt',
       # TODO(etiennej): DEPS mac NDK and use it on macs.
       'linux-x86_64',
       'bin',
       'arm-linux-androideabi-gdb')
   python_gdb_script_path = os.path.join(os.path.dirname(__file__),
                                         'android_gdb', 'session.py')
   debug_session_arguments = {}
   if args.build_dir:
-    debug_session_arguments["build_directory"] = args.build_dir
+    debug_session_arguments["build_directory_list"] = args.build_dir
   else:
     try:
-      debug_session_arguments["build_directory"] = os.path.join(
+      debug_session_arguments["build_directory_list"] = os.path.join(
           _get_dir_above('out'), 'out', 'android_Debug')
-      if not os.path.exists(debug_session_arguments["build_directory"]):
+      if not os.path.exists(debug_session_arguments["build_directory_list"]):
         raise DirectoryNotFoundException()
     except DirectoryNotFoundException:
       logging.fatal("Unable to find the build directory, please specify it "
                     "using --build-dir.")
       return
 
   if args.package_name:
     debug_session_arguments["package_name"] = args.package_name
   else:
     debug_session_arguments["package_name"] = _DEFAULT_PACKAGE_NAME
@@ skipping 60 matching lines @@
   gdb_subparser = gdb_parser.add_subparsers(
       help='Commands to GDB')
 
   gdb_attach_parser = gdb_subparser.add_parser(
       'attach', help='Attach GDB to a running Mojo Shell process')
   gdb_attach_parser.add_argument('--adb-path', type=str,
       help='path to the adb tool from the Android SDK (optional)')
   gdb_attach_parser.add_argument('--ndk-dir', type=str,
       help='path to the directory containing the Android NDK')
   gdb_attach_parser.add_argument('--build-dir', type=str,
-      help='path to the build directory')
+      help='List of paths to build directories, separated by commas')

[qsr (NOT THE RIGHT qsr), 2015/09/03 10:34:04]

Do you think it is better to do it this way, instead of allowing to set this
argument multiple times?

[etiennej, 2015/09/03 11:45:44]

Good point. I also changed the device stack command that I modified in a similar
way earlier.

   gdb_attach_parser.add_argument('--pyelftools-dir', type=str,
       help='Path to a directory containing third party libraries')
   gdb_attach_parser.add_argument('--gsutil-dir', type=str,
       help='Path to a directory containing gsutil')
   gdb_attach_parser.add_argument('--package-name', type=str,
       help='Name of the Mojo Shell android package to debug')
   gdb_attach_parser.set_defaults(func=_gdb_attach)
 
 
 def main():
   parser = argparse.ArgumentParser(description='Command-line interface for '
                                                 'mojo:debugger')
   subparsers = parser.add_subparsers(help='the tool to run')
   _add_device_command(subparsers)
   _add_tracing_command(subparsers)
   _add_wm_command(subparsers)
   _add_gdb_command(subparsers)
 
   args = parser.parse_args()
   return args.func(args)
 
 if __name__ == '__main__':
   sys.exit(main())