Update from https://crrev.com/305340

build/android/surface_stats.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2013 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.
 
 """Command line tool for continuously printing Android graphics surface
 statistics on the console.
 """
 
 import collections
 import optparse
 import sys
 import time
 
+from pylib.device import adb_wrapper
+from pylib.device import device_errors
 from pylib.device import device_utils
 from pylib.perf import surface_stats_collector
 from pylib.utils import run_tests_helper
 
 
 _FIELD_FORMAT = {
   'jank_count (janks)': '%d',
   'max_frame_delay (vsyncs)': '%d',
   'avg_surface_fps (fps)': '%.2f',
   'frame_lengths (vsyncs)': '%.3f',
@@ skipping 65 matching lines @@
   parser.add_option('-d',
                     '--delay',
                     dest='delay',
                     default=1,
                     type='float',
                     help='Time in seconds to sleep between updates.')
 
   options, _ = parser.parse_args(argv)
   run_tests_helper.SetLogLevel(options.verbose_count)
 
-  device = device_utils.DeviceUtils(options.device)
+  if options.device:
+    device = device_utils.DeviceUtils(options.device)
+  else:
+    devices = adb_wrapper.AdbWrapper.GetDevices()
+    if not devices:
+      raise device_errors.NoDevicesError
+    device = device_utils.DeviceUtils(devices[0])
+
   collector = surface_stats_collector.SurfaceStatsCollector(device)
   collector.DisableWarningAboutEmptyData()
 
   fields = options.fields.split(',')
   row_count = None
 
   try:
     collector.Start()
     while True:
       time.sleep(options.delay)
@@ skipping 12 matching lines @@
       _PrintResults(results)
       row_count += 1
   except KeyboardInterrupt:
     sys.exit(0)
   finally:
     collector.Stop()
 
 
 if __name__ == '__main__':
   main(sys.argv)