Add traces for main omnibox providers

components/omnibox/browser/search_provider.cc

 // Copyright 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/search_provider.h"
 
 #include <stddef.h>
 #include <algorithm>
 #include <cmath>
 #include <utility>
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/i18n/break_iterator.h"
 #include "base/i18n/case_conversion.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/user_metrics.h"
 #include "base/rand_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/trace_event/trace_event.h"
 #include "components/data_use_measurement/core/data_use_user_data.h"
 #include "components/history/core/browser/in_memory_database.h"
 #include "components/history/core/browser/keyword_search_term.h"
 #include "components/metrics/proto/omnibox_input_type.pb.h"
 #include "components/omnibox/browser/autocomplete_provider_client.h"
 #include "components/omnibox/browser/autocomplete_provider_listener.h"
 #include "components/omnibox/browser/autocomplete_result.h"
 #include "components/omnibox/browser/keyword_provider.h"
 #include "components/omnibox/browser/omnibox_field_trial.h"
 #include "components/omnibox/browser/suggestion_answer.h"
@@ skipping 179 matching lines @@
 // static
 ACMatches::iterator SearchProvider::FindTopMatch(ACMatches* matches) {
   ACMatches::iterator it = matches->begin();
   while ((it != matches->end()) && !it->allowed_to_be_default_match)
     ++it;
   return it;
 }
 
 void SearchProvider::Start(const AutocompleteInput& input,
                            bool minimal_changes) {
+  TRACE_EVENT0("omnibox", "SearchProvider::Start");
   // Do our best to load the model as early as possible.  This will reduce
   // odds of having the model not ready when really needed (a non-empty input).
   TemplateURLService* model = client()->GetTemplateURLService();
   DCHECK(model);
   model->Load();
 
   matches_.clear();
   set_field_trial_triggered(false);
 
   // Can't return search/suggest results for bogus input.
@@ skipping 148 matching lines @@
   // Hence, it's always necessary to update matches to use the new template
   // URL.  (One could cache the template URL and only call UpdateMatches() and
   // OnProviderUpdate() if a keyword was deleted/renamed or the template URL
   // was changed.  That would save extra calls to these functions.  However,
   // this is uncommon and not likely to be worth the extra work.)
   UpdateMatches();
   listener_->OnProviderUpdate(true);  // always pretend something changed
 }
 
 void SearchProvider::OnURLFetchComplete(const net::URLFetcher* source) {
+  TRACE_EVENT0("omnibox", "SearchProvider::OnURLFetchComplete");
   DCHECK(!done_);
   const bool is_keyword = source == keyword_fetcher_.get();
 
   // Ensure the request succeeded and that the provider used is still available.
   // A verbatim match cannot be generated without this provider, causing errors.
   const bool request_succeeded =
       source->GetStatus().is_success() && (source->GetResponseCode() == 200) &&
       GetTemplateURL(is_keyword);
 
   LogFetchComplete(request_succeeded, is_keyword);
@@ skipping 1108 matching lines @@
   for (MatchMap::const_iterator i(map.begin()); i != map.end(); ++i)
     matches.push_back(i->second);
   std::sort(matches.begin(), matches.end(), &AutocompleteMatch::MoreRelevant);
 
   // If there is a top scoring entry, find the corresponding answer.
   if (!matches.empty())
     return answers_cache_.GetTopAnswerEntry(matches[0].contents);
 
   return AnswersQueryData();
 }