[Android] Add screenshot command line tool.

build/android/screenshot.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.
+
+"""Takes and saves a screenshot from an Android device.
+
+Usage: screenshot.py [-s SERIAL] [-f FILE]
+
+Options:
+  -s SERIAL  connect to device with specified SERIAL
+  -f FILE    write screenshot to FILE (default: Screenshot.png)
+"""
+
+from optparse import OptionParser
+import os
+import sys
+
+from pylib import android_commands

[frankf, 2012/12/06 21:44:42]

Two blank lines here.

+
+def main(argv):
+  # Parse options.
+  parser = OptionParser()
+  parser.add_option("-s", "--serial", dest="serial",

[frankf, 2012/12/06 21:44:42]

Use single quotes for consistency.

[frankf, 2012/12/06 21:50:14]

Also, how does this behave if no serial is given and multiple devices are
attached?

+                    help="connect to device with specified SERIAL",
+                    metavar="SERIAL", default=None)
+  parser.add_option("-f", "--file", dest="filename",
+                    help="write screenshot to FILE (default: %default)",
+                    metavar="FILE", default="Screenshot.png")
+  (options, args) = parser.parse_args(argv)
+
+  # Grab screenshot and write to disk.
+  filename = os.path.abspath(options.filename)
+  ac = android_commands.AndroidCommands(options.serial)
+  ac.TakeScreenshot(filename)
+  return 0
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))