[android] Split top-level scripts and libraries from build/android.

build/android/emulator.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.
 
 """Provides an interface to start and stop Android emulator.
 
 Assumes system environment ANDROID_NDK_ROOT has been set.
 
   Emulator: The class provides the methods to launch/shutdown the emulator with
             the android virtual device named 'buildbot' .
 """
 
 import logging
 import os
 import signal
 import subprocess
 import sys
 import time
 
-import android_commands
+from pylib import android_commands
+from pylib import cmd_helper
 
 # adb_interface.py is under ../../third_party/android_testrunner/
 sys.path.append(os.path.join(os.path.abspath(os.path.dirname(__file__)), '..',
    '..', 'third_party', 'android_testrunner'))
 import adb_interface
-import cmd_helper
 import errors
 import run_command
 
 class EmulatorLaunchException(Exception):
   """Emulator failed to launch."""
   pass
 
 def _KillAllEmulators():
   """Kill all running emulators that look like ones we started.
 
@@ skipping 207 matching lines @@
     """Install a handler to kill the emulator when we exit unexpectedly."""
     for sig in self._SIGNALS:
       signal.signal(sig, self._ShutdownOnSignal)
 
 def main(argv):
   Emulator(True).Launch(True)
 
 
 if __name__ == '__main__':
   main(sys.argv)