[IndexedDB] Adding traces, perf tests

content/browser/indexed_db/leveldb/leveldb_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/leveldb/leveldb_transaction.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
+#include "base/trace_event/trace_event.h"
 #include "content/browser/indexed_db/leveldb/leveldb_database.h"
 #include "content/browser/indexed_db/leveldb/leveldb_write_batch.h"
 #include "third_party/leveldatabase/src/include/leveldb/db.h"
 
 using base::StringPiece;
 
 namespace content {
 
 LevelDBTransaction::LevelDBTransaction(LevelDBDatabase* db)
     : db_(db),
@@ skipping 61 matching lines @@
   }
 
   leveldb::Status s = db_->Get(key, value, found, &snapshot_);
   if (!s.ok())
     DCHECK(!*found);
   return s;
 }
 
 leveldb::Status LevelDBTransaction::Commit() {
   DCHECK(!finished_);
+  TRACE_EVENT0("LevelDB", "LevelDBTransaction::Commit");
 
   if (data_.empty()) {
     finished_ = true;
     return leveldb::Status::OK();
   }
 
   base::TimeTicks begin_time = base::TimeTicks::Now();
   scoped_ptr<LevelDBWriteBatch> write_batch = LevelDBWriteBatch::Create();
 
   for (const auto& iterator : data_) {
@@ skipping 374 matching lines @@
   return s;
 }
 
 void LevelDBDirectTransaction::Remove(const StringPiece& key) {
   DCHECK(!finished_);
   write_batch_->Remove(key);
 }
 
 leveldb::Status LevelDBDirectTransaction::Commit() {
   DCHECK(!finished_);
+  TRACE_EVENT0("LevelDB", "LevelDBDirectTransaction::Commit");
 
   leveldb::Status s = db_->Write(*write_batch_);
   if (s.ok()) {
     finished_ = true;
     write_batch_->Clear();
   }
   return s;
 }
 
 }  // namespace content