Add traces for main omnibox providers

components/omnibox/browser/zero_suggest_provider.cc

 // Copyright (c) 2012 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.
 
 #include "components/omnibox/browser/zero_suggest_provider.h"
 
 #include <stddef.h>
 
 #include "base/callback.h"
 #include "base/i18n/case_conversion.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/user_metrics.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
+#include "base/trace_event/trace_event.h"
 #include "components/data_use_measurement/core/data_use_user_data.h"
 #include "components/history/core/browser/history_types.h"
 #include "components/history/core/browser/top_sites.h"
 #include "components/metrics/proto/omnibox_input_type.pb.h"
 #include "components/omnibox/browser/autocomplete_classifier.h"
 #include "components/omnibox/browser/autocomplete_input.h"
 #include "components/omnibox/browser/autocomplete_match.h"
 #include "components/omnibox/browser/autocomplete_provider_listener.h"
 #include "components/omnibox/browser/history_url_provider.h"
 #include "components/omnibox/browser/omnibox_field_trial.h"
@@ skipping 50 matching lines @@
 
 // static
 void ZeroSuggestProvider::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterStringPref(omnibox::kZeroSuggestCachedResults,
                                std::string());
 }
 
 void ZeroSuggestProvider::Start(const AutocompleteInput& input,
                                 bool minimal_changes) {
+  TRACE_EVENT0("omnibox", "ZeroSuggestProvider::Start");
   matches_.clear();
   if (!input.from_omnibox_focus() ||
       input.type() == metrics::OmniboxInputType::INVALID)
     return;
 
   Stop(true, false);
   set_field_trial_triggered(false);
   set_field_trial_triggered_in_session(false);
   results_from_cache_ = false;
   permanent_text_ = input.text();
@@ skipping 367 matching lines @@
   if (!json_data.empty()) {
     scoped_ptr<base::Value> data(
         SearchSuggestionParser::DeserializeJsonData(json_data));
     if (data && ParseSuggestResults(
             *data, kDefaultZeroSuggestRelevance, false, &results_)) {
       ConvertResultsToAutocompleteMatches();
       results_from_cache_ = !matches_.empty();
     }
   }
 }