Add a --startup option to generate combined traces for startup.

tools/profile_chrome_startup.py

Index: tools/profile_chrome_startup.py
diff --git a/tools/profile_chrome_startup.py b/tools/profile_chrome_startup.py
new file mode 100755
index 0000000000000000000000000000000000000000..5620907a2a92807e83ea303d4878993f2ab759a4
--- /dev/null
+++ b/tools/profile_chrome_startup.py
@@ -0,0 +1,97 @@
+#!/usr/bin/env 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.
+
+import logging
+import optparse
+import os
+import sys
+import webbrowser
+
+sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir,
+                             'build', 'android'))
+
+from profile_chrome import chrome_startup_controller
+from profile_chrome import controllers
+from profile_chrome import flags
+from profile_chrome import profiler
+from profile_chrome import systrace_controller
+from profile_chrome import ui
+from pylib import android_commands
+from pylib.device import device_utils
+
+
+def _CreateOptionParser():
+  parser = optparse.OptionParser(description='Record about://tracing profiles '
+                                 'from Android browsers startup, combined with '
+                                 'Android systrace. See http://dev.chromium.org'
+                                 '/developers/how-tos/trace-event-profiling-'
+                                 'tool for detailed instructions for '
+                                 'profiling.')
+  parser.add_option('--url', help='URL to visit on startup. Default: '
+                    'https://www.google.com', default='https://www.google.com',
+                    metavar='URL')
+  parser.add_option('--cold', help='Flush the OS page cache before starting the'
+                    ' browser. Note that this require a device with root '
+                    'access.', default=False, action='store_true')
+  parser.add_option_group(flags.SystraceOptions(parser))
+  parser.add_option_group(flags.OutputOptions(parser))
+
+  browsers = sorted(profiler.GetSupportedBrowsers().keys())
+  parser.add_option('-b', '--browser', help='Select among installed browsers. '
+                    'One of ' + ', '.join(browsers) + ', "stable" is used by '
+                    'default.', type='choice', choices=browsers,
+                    default='stable')
+  parser.add_option('-v', '--verbose', help='Verbose logging.',
+                    action='store_true')
+  parser.add_option('-z', '--compress', help='Compress the resulting trace '
+                    'with gzip. ', action='store_true')
+  return parser
+
+
+def main():
+  parser = _CreateOptionParser()
+  options, _ = parser.parse_args()
+
+  if options.verbose:
+    logging.getLogger().setLevel(logging.DEBUG)
+
+  devices = android_commands.GetAttachedDevices()
+  if len(devices) != 1:
+    logging.error('Exactly 1 device must be attached.')
+    return 1
+  device = device_utils.DeviceUtils(devices[0])
+  package_info = profiler.GetSupportedBrowsers()[options.browser]
+
+  if options.systrace_categories in ['list', 'help']:
+    ui.PrintMessage('\n'.join(
+        systrace_controller.SystraceController.GetCategories(device)))
+    return 0
+  systrace_categories = (options.systrace_categories.split(',')
+                         if options.systrace_categories else [])
+  enabled_controllers = []
+  # Enable the systrace and chrome controller. The systrace controller should go
+  # first because otherwise the resulting traces miss early systrace data.
+  if systrace_categories:
+    enabled_controllers.append(systrace_controller.SystraceController(
+        device, systrace_categories, False))
+  enabled_controllers.append(
+      chrome_startup_controller.ChromeStartupTracingController(
+          device, package_info, options.cold, options.url))
+  if options.output:
+    options.output = os.path.expanduser(options.output)
+  result = profiler.CaptureProfile(enabled_controllers, 0,
+                                   output=options.output,
+                                   compress=options.compress,
+                                   write_json=options.json)
+  if options.view:
+    if sys.platform == 'darwin':
+      os.system('/usr/bin/open %s' % os.path.abspath(result))
+    else:
+      webbrowser.open(result)
+
+
+if __name__ == '__main__':
+  sys.exit(main())