Add default file for command line arguments.

mojo/devtools/common/devtoolslib/android_shell.py

 # 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 atexit
 import hashlib
 import logging
 import os
 import os.path
 import random
 import re
 import subprocess
 import sys
 import tempfile
 import threading
 import time
 import uuid
 
 from devtoolslib import http_server
 from devtoolslib.shell import Shell
 from devtoolslib.utils import overrides
 
 
 # Tags used by mojo shell Java logging.
 _LOGCAT_JAVA_TAGS = [
     'AndroidHandler',
     'MojoFileHelper',
-    'MojoMain',
-    'MojoShellActivity',
     'MojoShellApplication',
+    'ShellService',
 ]
 
 _MOJO_SHELL_PACKAGE_NAME = 'org.chromium.mojo.shell'
 
 # Used to parse the output of `adb devices`.
 _ADB_DEVICES_HEADER = 'List of devices attached'
 
 
 _logger = logging.getLogger()
 
@@ skipping 388 matching lines @@
           Results.output = rf.read()
 
     run_thread = threading.Thread(target=do_run)
     run_thread.start()
     run_thread.join(timeout)
 
     if run_thread.is_alive():
       self.stop_shell()
       return None, Results.output, True
     return None, Results.output, False