Add traces for main omnibox providers

components/omnibox/browser/shortcuts_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/shortcuts_provider.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <cmath>
 #include <map>
 #include <vector>
 
 #include "base/i18n/break_iterator.h"
 #include "base/i18n/case_conversion.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.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/history/core/browser/history_service.h"
 #include "components/metrics/proto/omnibox_input_type.pb.h"
 #include "components/omnibox/browser/autocomplete_i18n.h"
 #include "components/omnibox/browser/autocomplete_input.h"
 #include "components/omnibox/browser/autocomplete_match.h"
 #include "components/omnibox/browser/autocomplete_provider_client.h"
 #include "components/omnibox/browser/autocomplete_result.h"
 #include "components/omnibox/browser/history_provider.h"
 #include "components/omnibox/browser/omnibox_field_trial.h"
 #include "components/omnibox/browser/url_prefix.h"
@@ skipping 26 matching lines @@
   scoped_refptr<ShortcutsBackend> backend = client_->GetShortcutsBackend();
   if (backend.get()) {
     backend->AddObserver(this);
     if (backend->initialized())
       initialized_ = true;
   }
 }
 
 void ShortcutsProvider::Start(const AutocompleteInput& input,
                               bool minimal_changes) {
+  TRACE_EVENT0("omnibox", "ShortcutsProvider::Start");
   matches_.clear();
 
   if (input.from_omnibox_focus() ||
       (input.type() == metrics::OmniboxInputType::INVALID) ||
       (input.type() == metrics::OmniboxInputType::FORCED_QUERY) ||
       input.text().empty() || !initialized_)
     return;
 
   base::TimeTicks start_time = base::TimeTicks::Now();
   GetMatches(input);
@@ skipping 336 matching lines @@
   const double kMaxDecaySpeedDivisor = 5.0;
   const double kNumUsesPerDecaySpeedDivisorIncrement = 5.0;
   double decay_divisor = std::min(
       kMaxDecaySpeedDivisor,
       (shortcut.number_of_hits + kNumUsesPerDecaySpeedDivisorIncrement - 1) /
           kNumUsesPerDecaySpeedDivisorIncrement);
 
   return static_cast<int>((base_score / exp(decay_exponent / decay_divisor)) +
                           0.5);
 }