Add traces for main omnibox providers

components/omnibox/browser/autocomplete_controller.cc

Index: components/omnibox/browser/autocomplete_controller.cc
diff --git a/components/omnibox/browser/autocomplete_controller.cc b/components/omnibox/browser/autocomplete_controller.cc
index df7990d9d3a932a1a58398f4c651963aad3c98f7..19be64e4f028381da1db02273df89b7138cb1dbd 100644
--- a/components/omnibox/browser/autocomplete_controller.cc
+++ b/components/omnibox/browser/autocomplete_controller.cc
@@ -14,7 +14,9 @@
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
+#include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
 #include "components/omnibox/browser/autocomplete_controller_delegate.h"
 #include "components/omnibox/browser/bookmark_provider.h"
@@ -231,6 +233,8 @@ AutocompleteController::~AutocompleteController() {
 }
 
 void AutocompleteController::Start(const AutocompleteInput& input) {
+  TRACE_EVENT1("omnibox", "AutocompleteController::Start",
+               "text", base::UTF16ToUTF8(input.text()));
   const base::string16 old_input_text(input_.text());
   const bool old_want_asynchronous_matches = input_.want_asynchronous_matches();
   const bool old_from_omnibox_focus = input_.from_omnibox_focus();
@@ -395,6 +399,7 @@ void AutocompleteController::UpdateMatchDestinationURL(
 void AutocompleteController::UpdateResult(
     bool regenerate_result,
     bool force_notify_default_match_changed) {
+  TRACE_EVENT0("omnibox", "AutocompleteController::UpdateResult");
   const bool last_default_was_valid = result_.default_match() != result_.end();
   // The following three variables are only set and used if
   // |last_default_was_valid|.