Add bisect config validation.

scripts/slave/recipes/bisect_test/example_bisect_results.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.
 
 """This example file is meant to provide coverage to bisect_results."""
 
 DEPS = [
     'auto_bisect',
     'recipe_engine/json',
     'recipe_engine/path',
     'recipe_engine/properties',
     'recipe_engine/raw_io',
 ]
 
 BASIC_CONFIG = {
     'test_type': 'perf',
     'command':
         ('src/tools/perf/run_benchmark -v --browser=release smoothness.'
          'tough_scrolling_cases'),
     'good_revision': '314015',
     'bad_revision': '314017',
     'metric': 'mean_input_event_latency/mean_input_event_latency',
     'repeat_count': '2',
     'max_time_minutes': '5',
-    'truncate_percent': '0',
-    'bug_id': '',
     'gs_bucket': 'chrome-perf',
     'builder_host': 'master4.golo.chromium.org',
     'builder_port': '8341',
     'dummy_builds': 'True',
     'dummy_job_names': 'True',
     'bypass_stats_check': 'True',
     'skip_gclient_ops': 'True',
 }
 
 BASIC_ATTRIBUTES = {
@@ skipping 130 matching lines @@
   aborted_bisect_test = api.test('aborted_non_telemetry_test')
   aborted_bisect_test = get_post_bisect_step_data(api, aborted_bisect_test)
   aborted_bisect_test = add_revision_mapping(api, aborted_bisect_test, '314015',
                                              'c001c0de')
   aborted_bisect_test = add_revision_mapping(api, aborted_bisect_test, '314017',
                                              'deadbeef')
   aborted_bisect_test += api.properties(
       bisect_config = NON_TELEMETRY_TEST_CONFIG,
       dummy_bisector_attributes = ABORTED_BISECT_ATTRIBUTES)
   yield aborted_bisect_test