Support HTTP test-server based net unit tests on Android.

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 8b501309060bc5943afbc9c7e96fb1ce97eac397..46b6981195ebcecf9b2ed43c1d13eace39d4b00a 100644
--- a/build/android/pylib/cmd_helper.py
+++ b/build/android/pylib/cmd_helper.py
@@ -40,11 +40,28 @@ def GetCmdOutput(args, cwd=None, shell=False):
     Captures and returns the command's stdout.
     Prints the command's stderr to logger (which defaults to stdout).
   """
+  (_, output) = GetCmdStatusAndOutput(args, cwd, shell)
+  return output
+
+def GetCmdStatusAndOutput(args, cwd=None, shell=False):
+  """Executes a subprocess and returns its exit code and 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:
+    The tuple (exit code, output).
+  """
   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()
+  exit_code = p.returncode
   if stderr:
     logging.critical(stderr)
   logging.info(stdout[:4096])  # Truncate output longer than 4k.
-  return stdout
+  return (exit_code, stdout)