Added a whitelist for trace events that are known to be PII-less.

chrome/chrome_common.gypi

 # Copyright (c) 2013 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.
 
 {
   'variables': {
     # File lists shared with GN build.
     'chrome_common_sources': [
       'common/all_messages.h',
       'common/attrition_experiments.h',
@@ skipping 92 matching lines @@
       'common/search_urls.h',
       'common/secure_origin_whitelist.cc',
       'common/secure_origin_whitelist.h',
       'common/spellcheck_common.cc',
       'common/spellcheck_common.h',
       'common/spellcheck_marker.h',
       'common/spellcheck_messages.h',
       'common/spellcheck_result.h',
       'common/switch_utils.cc',
       'common/switch_utils.h',
+      'common/trace_event_args_whitelist.cc',
+      'common/trace_event_args_whitelist.h',
       'common/tts_messages.h',
       'common/tts_utterance_request.cc',
       'common/tts_utterance_request.h',
       'common/url_constants.cc',
       'common/url_constants.h',
       'common/v8_breakpad_support_win.cc',
       'common/v8_breakpad_support_win.h',
       'common/variations/experiment_labels.cc',
       'common/variations/experiment_labels.h',
       'common/variations/variations_util.cc',
@@ skipping 559 matching lines @@
         'common/safe_browsing/csd.proto'
       ],
       'variables': {
         'proto_in_dir': 'common/safe_browsing',
         'proto_out_dir': 'chrome/common/safe_browsing',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }