Instrumenting opening password database to find jank

components/password_manager/core/browser/login_database.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/password_manager/core/browser/login_database.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/pickle.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/time/time.h"
 #include "components/autofill/core/common/password_form.h"
 #include "components/password_manager/core/browser/password_manager_client.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 #include "google_apis/gaia/gaia_urls.h"
 #include "sql/connection.h"
 #include "sql/statement.h"
 #include "sql/transaction.h"
@@ skipping 124 matching lines @@
 LoginDatabase::~LoginDatabase() {
 }
 
 bool LoginDatabase::Init(const base::FilePath& db_path) {
   // Set pragmas for a small, private database (based on WebDatabase).
   db_.set_page_size(2048);
   db_.set_cache_size(32);
   db_.set_exclusive_locking();
   db_.set_restrict_to_user();
 
-  if (!db_.Open(db_path)) {
-    LOG(WARNING) << "Unable to open the password store database.";
-    return false;
+  {
+    // TODO(vadimt): Remove ScopedTracker below once crbug.com/138903 is fixed.
+    tracked_objects::ScopedTracker tracking_profile(
+        FROM_HERE_WITH_EXPLICIT_FUNCTION("138903 LoginDatabase::Init db init"));
+
+    if (!db_.Open(db_path)) {
+      LOG(WARNING) << "Unable to open the password store database.";
+      return false;
+    }
   }
 
   sql::Transaction transaction(&db_);
   transaction.Begin();
 
   // Check the database version.
   if (!meta_table_.Init(&db_, kCurrentVersionNumber,
                         kCompatibleVersionNumber)) {
     db_.Close();
     return false;
@@ skipping 664 matching lines @@
 
 bool LoginDatabase::DeleteAndRecreateDatabaseFile() {
   DCHECK(db_.is_open());
   meta_table_.Reset();
   db_.Close();
   sql::Connection::Delete(db_path_);
   return Init(db_path_);
 }
 
 }  // namespace password_manager