[IndexedDB] Adding traces, perf tests

content/browser/indexed_db/indexed_db_transaction.cc

 // Copyright (c) 2013 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 "content/browser/indexed_db/indexed_db_transaction.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 297 matching lines @@
   CloseOpenCursors();
   transaction_->Reset();
 
   // Transactions must also be marked as completed before the
   // front-end is notified, as the transaction completion unblocks
   // operations like closing connections.
   database_->transaction_coordinator().DidFinishTransaction(this);
 
   if (committed) {
     abort_task_stack_.clear();
-    callbacks_->OnComplete(id_);
+    {
+      IDB_TRACE1(
+          "IndexedDBTransaction::CommitPhaseTwo.TransactionCompleteCallbacks",
+          "txn.id", id());
+      callbacks_->OnComplete(id_);
+    }
     database_->TransactionFinished(this, true);
   } else {
     while (!abort_task_stack_.empty())
       abort_task_stack_.pop().Run(NULL);
 
     IndexedDBDatabaseError error;
     if (leveldb_env::IndicatesDiskFull(s)) {
       error = IndexedDBDatabaseError(
           blink::WebIDBDatabaseExceptionQuotaError,
           "Encountered disk full while committing transaction.");
@@ skipping 73 matching lines @@
   return base::TimeDelta::FromSeconds(kInactivityTimeoutPeriodSeconds);
 }
 
 void IndexedDBTransaction::Timeout() {
   Abort(IndexedDBDatabaseError(
       blink::WebIDBDatabaseExceptionTimeoutError,
       base::ASCIIToUTF16("Transaction timed out due to inactivity.")));
 }
 
 void IndexedDBTransaction::CloseOpenCursors() {
+  IDB_TRACE1("IndexedDBTransaction::CloseOpenCursors", "txn.id", id());
   for (auto* cursor : open_cursors_)
     cursor->Close();
   open_cursors_.clear();
 }
 
 }  // namespace content