Augment the browser startup timeout when using the PGO profiler.

telemetry/telemetry/internal/platform/profiler/win_pgo_profiler.py

 # Copyright 2014 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 glob
 import os
 import subprocess
 import sys
 
 from telemetry.internal.platform import profiler
 
 _PGOSWEEP_EXECUTABLE = 'pgosweep.exe'
 
 
 class WinPGOProfiler(profiler.Profiler):
   """A profiler that run the Visual Studio PGO utility 'pgosweep.exe' before
   terminating a browser or a renderer process.
+
+  TODO(sebmarchand): Stop relying on Telemetry to do this, move this logic to
+  Chrome.
   """
 
   def __init__(self, browser_backend, platform_backend, output_path, state):
     super(WinPGOProfiler, self).__init__(
         browser_backend, platform_backend, output_path, state)
 
     self._pgosweep_path = None
 
     if os.path.exists(os.path.join(browser_backend.browser_directory,
                                    _PGOSWEEP_EXECUTABLE)):
@@ skipping 54 matching lines @@
   def is_supported(cls, browser_type):
     # This profiler only make sense when doing a Windows build with Visual
     # Studio (minimal supported version is 2013 Update 2).
     return sys.platform.startswith('win')
 
   @classmethod
   def CustomizeBrowserOptions(cls, browser_type, options):
     # The sandbox need to be disabled if we want to be able to gather the
     # profile data.
     options.AppendExtraBrowserArgs('--no-sandbox')
+    # Augment the startup timeout as a PGO instrumented build takes more time to
+    # start than a regular build.
+    options.browser_options.browser_startup_timeout *= 4
 
   def CollectProfile(self):
     """Collect the profile data for the current processes."""
     output_files = []
     for pid, output_file in self._GetProcessOutputFileMap().iteritems():
       if 'renderer' in output_file:
         output_files.append(self._RunPGOSweep(pid,
                                               'chrome_child',
                                               self._chrome_child_pgc_counter))
         self._chrome_child_pgc_counter += 1
     return output_files