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

build/android/cmd_helper.py

-#!/usr/bin/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.
-
-"""A wrapper for subprocess to make calling shell commands easier."""
-
-
-import logging
-import subprocess
-
-
-def RunCmd(args, cwd=None):
-  """Opens a subprocess to execute a program and returns its return value.
-
-  Args:
-    args: A string or a sequence of program arguments. The program to execute is
-      the string or the first item in the args sequence.
-    cwd: If not None, the subprocess's current directory will be changed to
-      |cwd| before it's executed.
-
-  Returns:
-    Return code from the command execution.
-  """
-  logging.info(str(args) + ' ' + (cwd or ''))
-  p = subprocess.Popen(args=args, cwd=cwd)
-  return p.wait()
-
-
-def GetCmdOutput(args, cwd=None, shell=False):
-  """Open a subprocess to execute a program and returns its output.
-
-  Args:
-    args: A string or a sequence of program arguments. The program to execute is
-      the string or the first item in the args sequence.
-    cwd: If not None, the subprocess's current directory will be changed to
-      |cwd| before it's executed.
-    shell: Whether to execute args as a shell command.
-
-  Returns:
-    Captures and returns the command's stdout.
-    Prints the command's stderr to logger (which defaults to stdout).
-  """
-  logging.info(str(args) + ' ' + (cwd or ''))
-  p = subprocess.Popen(args=args, cwd=cwd, stdout=subprocess.PIPE,
-                       stderr=subprocess.PIPE, shell=shell)
-  stdout, stderr = p.communicate()
-  if stderr:
-    logging.critical(stderr)
-  logging.info(stdout[:4096])  # Truncate output longer than 4k.
-  return stdout