Add traces for main omnibox providers

components/omnibox/browser/keyword_provider.cc

 // Copyright 2014 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/keyword_provider.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/trace_event/trace_event.h"
 #include "components/metrics/proto/omnibox_input_type.pb.h"
 #include "components/omnibox/browser/autocomplete_match.h"
 #include "components/omnibox/browser/autocomplete_provider_client.h"
 #include "components/omnibox/browser/autocomplete_provider_listener.h"
 #include "components/omnibox/browser/keyword_extensions_delegate.h"
 #include "components/omnibox/browser/omnibox_field_trial.h"
 #include "components/omnibox/browser/search_provider.h"
 #include "components/search_engines/template_url.h"
 #include "components/search_engines/template_url_service.h"
 #include "grit/components_strings.h"
@@ skipping 177 matching lines @@
     const AutocompleteInput& input) {
   // A verbatim match is allowed to be the default match.
   return CreateAutocompleteMatch(
       GetTemplateURLService()->GetTemplateURLForKeyword(keyword),
       keyword.length(), input, keyword.length(),
       SplitReplacementStringFromInput(text, true), true, 0);
 }
 
 void KeywordProvider::Start(const AutocompleteInput& input,
                             bool minimal_changes) {
+  TRACE_EVENT0("omnibox", "KeywordProvider::Start");
   // This object ensures we end keyword mode if we exit the function without
   // toggling keyword mode to on.
   ScopedEndExtensionKeywordMode keyword_mode_toggle(extensions_delegate_.get());
 
   matches_.clear();
 
   if (!minimal_changes) {
     done_ = true;
 
     // Input has changed. Increment the input ID so that we can discard any
@@ skipping 275 matching lines @@
         ACMatchClassification::NONE, &match->contents_class);
   }
 }
 
 TemplateURLService* KeywordProvider::GetTemplateURLService() const {
   // Make sure the model is loaded. This is cheap and quickly bails out if
   // the model is already loaded.
   model_->Load();
   return model_;
 }