tools: Log time to first contentful paint in customtabs_benchmark.

tools/android/customtabs_benchmark/scripts/customtabs_benchmark.py

 #!/usr/bin/python
 #
 # Copyright 2015 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.
 
 """Loops Custom Tabs tests and outputs the results into a CSV file."""
 
 import logging
 import optparse
@@ skipping 60 matching lines @@
     device: (DeviceUtils) device to run the tests on.
     warmup: (bool) Whether to call warmup.
     prerender_mode: (str) Prerender mode (disabled, enabled or prefetch).
     delay_to_may_launch_url: (int) Delay to mayLaunchUrl() in ms.
     delay_to_launch_url: (int) Delay to launchUrl() in ms.
     cold: (bool) Whether the page cache should be dropped.
 
   Returns:
     The output line (str), like this (one line only):
     <warmup>,<prerender_mode>,<delay_to_may_launch_url>,<delay_to_launch>,
-      <intent_sent_ms>,<page_load_started_ms>,<page_load_finished_ms>
+      <intent_sent_ms>,<page_load_started_ms>,<page_load_finished_ms>,
+      <first_contentful_paint>
     or None on error.
   """
   launch_intent = intent.Intent(
       action='android.intent.action.MAIN',
       package='org.chromium.customtabsclient.test',
       activity='org.chromium.customtabs.test.MainActivity',
       extras={'url': url, 'warmup': warmup, 'prerender_mode': prerender_mode,
               'delay_to_may_launch_url': delay_to_may_launch_url,
               'delay_to_launch_url': delay_to_launch_url})
   result_line_re = re.compile(r'CUSTOMTABSBENCH.*: (.*)')
@@ skipping 55 matching lines @@
 
   Returns:
     A numpy structured array.
   """
   import numpy as np
   data = np.genfromtxt(filename, delimiter=',')
   result = np.array(np.zeros(len(data)),
                     dtype=[('warmup', bool), ('prerender_mode', np.int32),
                            ('delay_to_may_launch_url', np.int32),
                            ('delay_to_launch_url', np.int32),
-                           ('commit', np.int32), ('plt', np.int32)])
+                           ('commit', np.int32), ('plt', np.int32),
+                           ('first_contentful_paint', np.int32)])
   result['warmup'] = data[:, 0]
   result['prerender_mode'] = data[:, 1]
   result['delay_to_may_launch_url'] = data[:, 2]
   result['delay_to_launch_url'] = data[:, 3]
   result['commit'] = data[:, 5] - data[:, 4]
   result['plt'] = data[:, 6] - data[:, 4]
+  result['first_contentful_paint'] = data[7]
   return result
 
 
 def _CreateOptionParser():
   parser = optparse.OptionParser(description='Loops Custom Tabs tests on a '
                                  'device, and outputs the navigation timings '
                                  'in a CSV file.')
   parser.add_option('--device', help='Device ID')
   parser.add_option('--url', help='URL to navigate to.',
                     default='https://www.android.com')
@@ skipping 37 matching lines @@
       device, '/data/local/tmp/chrome-command-line',
       _CHROME_ARGS + ['--prerender=' + options.prerender_mode]):
       LoopOnDevice(device, options.url, options.warmup,
                    options.prerender_mode,
                    options.delay_to_may_launch_url, options.delay_to_launch_url,
                    options.cold, options.output_file, options.once)
 
 
 if __name__ == '__main__':
   main()