Nest multiple 'resolving hash xxx' steps under a single super step.

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 630 matching lines @@
     result = 'bisector.lkgr: %r\n' % self.lkgr
     result += 'bisector.fkbr: %r\n\n' % self.fkbr
     result += self._revision_value_table()
     if (self.lkgr and self.lkgr.values and self.fkbr and self.fkbr.values):
       result += '\n' + self._t_test_results()
     return result
 
   def _revision_value_table(self):
     """Returns a string table showing revisions and their values."""
     header = [['Revision', 'Values']]
-    rows = [[r.revision_string(), str(r.values)] for r in self.revisions]
+    with self._api.m.step.nest('Resolving hashes'):
+      rows = [[r.revision_string(), str(r.values)] for r in self.revisions]
     return self._pretty_table(header + rows)
 
   def _pretty_table(self, data):
     results = []
     for row in data:
       results.append('%-15s' * len(row) % tuple(row))
     return '\n'.join(results)
 
   def _t_test_results(self):
     """Returns a string showing t-test results for lkgr and fkbr."""
@@ skipping 300 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)