Add traces for main omnibox providers

components/omnibox/browser/bookmark_provider.cc

Index: components/omnibox/browser/bookmark_provider.cc
diff --git a/components/omnibox/browser/bookmark_provider.cc b/components/omnibox/browser/bookmark_provider.cc
index 40d84018fbebb074e5a2d507ef657e14a600871c..f9d3bde21f158ce68b65bf99132ee8655ad51fae 100644
--- a/components/omnibox/browser/bookmark_provider.cc
+++ b/components/omnibox/browser/bookmark_provider.cc
@@ -11,6 +11,7 @@
 #include "base/macros.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/trace_event/trace_event.h"
 #include "components/bookmarks/browser/bookmark_match.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/metrics/proto/omnibox_input_type.pb.h"
@@ -65,6 +66,7 @@ BookmarkProvider::BookmarkProvider(AutocompleteProviderClient* client)
 
 void BookmarkProvider::Start(const AutocompleteInput& input,
                              bool minimal_changes) {
+  TRACE_EVENT0("omnibox", "BookmarkProvider::Start");
   if (minimal_changes)
     return;
   matches_.clear();