android: Add screen recording tool

build/android/pylib/cmd_helper.py

 # 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 os
 import logging
 import pipes
 import signal
 import subprocess
 import tempfile
 
 import constants
 
 
-def Call(args, stdout=None, stderr=None, shell=None, cwd=None, env=None):
-  return subprocess.call(
+def Popen(args, stdout=None, stderr=None, shell=None, cwd=None, env=None):
+  return subprocess.Popen(
       args=args, cwd=cwd, stdout=stdout, stderr=stderr,
       shell=shell, close_fds=True, env=env,
       preexec_fn=lambda: signal.signal(signal.SIGPIPE, signal.SIG_DFL))
 
 
+def Call(args, stdout=None, stderr=None, shell=None, cwd=None, env=None):
+  pipe = Popen(args, stdout=stdout, stderr=stderr, shell=shell, cwd=cwd,
+               env=env)
+  pipe.communicate()
+  return pipe.wait()
+
+
 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:
@@ skipping 56 matching lines @@
   tmperr.close()
   if stderr:
     logging.critical(stderr)
   tmpout.seek(0)
   stdout = tmpout.read()
   tmpout.close()
   if len(stdout) > 4096:
     logging.debug('Truncated output:')
   logging.debug(stdout[:4096])
   return (exit_code, stdout)