Initiate the script that takes a snapshot of CPU usage

scripts/slave/recipe_modules/auto_bisect/bisector.py

 # 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 json
 import re
 import time
 import urllib
 
 from . import config_validation
@@ skipping 648 matching lines @@
     return '\n'.join(lines)
 
   def print_result_debug_info(self):
     """Prints extra debug info at the end of the bisect process."""
     lines = self._results_debug_message().splitlines()
     # If we emit a null step then add a log to it, the log should be kept
     # longer than 7 days (which is often needed to debug some issues).
     self.api.m.step('Debug Info', [])
     self.api.m.step.active_result.presentation.logs['Debug Info'] = lines
 
+  def print_result_debug_info_with_cpu_snapshot(self):

[prasadv, 2016/06/07 22:00:49]

can we rename this method name shorter? "print_cpu_snapshot"?

+    """Prints extra debug info with CPU snapshot at the

[prasadv, 2016/06/07 22:00:49]

Function docstring should be of single line summary. And the detail description
can be mentioned in a newline.

https://engdoc.corp.google.com/eng/doc/devguide/py/styleguide.shtml?cl=head#s...

+    end of the bisect process."""
+    lines = self._results_debug_message().splitlines()
+    for revision in self.revisions:
+        lines.append(str(revision.snapshot))
+    self.api.m.step('Debug Info with CPU Snapshot', [])
+    self.api.m.step.active_result.presentation.logs[
+            'Debug Info with CPU Snapshot'] = lines

[prasadv, 2016/06/07 22:00:49]

Need 4 space indentation. Or otherwise declare 
step_name = 'Debug Info with CPU Snapshot'
self.api.m.step(step_name, [])
self.api.m.step.active_result.presentation.logs[step_name] = lines

+
   def post_result(self, halt_on_failure=False):
     """Posts bisect results to Perf Dashboard."""
     self.api.m.perf_dashboard.set_default_config()
     self.api.m.perf_dashboard.post_bisect_results(
         self.get_result(), halt_on_failure)
 
   def get_revision_to_eval(self):
     """Gets the next RevisionState object in the candidate range.
 
     Returns:
@@ skipping 266 matching lines @@
         })
     return revision_rows
 
   def _get_build_url(self):
     properties = self.api.m.properties
     bot_url = properties.get('buildbotURL',
                              'http://build.chromium.org/p/chromium/')
     builder_name = urllib.quote(properties.get('buildername', ''))
     builder_number = str(properties.get('buildnumber', ''))
     return '%sbuilders/%s/builds/%s' % (bot_url, builder_name, builder_number)