android: Add screen recording tool

build/android/pylib/cmd_helper.py

Index: build/android/pylib/cmd_helper.py
diff --git a/build/android/pylib/cmd_helper.py b/build/android/pylib/cmd_helper.py
index bce3f97e6598268418341fb8cb128d14b5c6ac6a..dba399f8193f333ebcc94a880cb540ba83d90976 100644
--- a/build/android/pylib/cmd_helper.py
+++ b/build/android/pylib/cmd_helper.py
@@ -14,13 +14,20 @@ 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.