IndexedDB: Added timing histograms.

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 "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 68 matching lines @@
 }
 
 leveldb::Status LevelDBTransaction::Commit() {
   DCHECK(!finished_);
 
   if (data_.empty()) {
     finished_ = true;
     return leveldb::Status::OK();
   }
 
+  base::TimeTicks begin_time = base::TimeTicks::Now();
   scoped_ptr<LevelDBWriteBatch> write_batch = LevelDBWriteBatch::Create();
 
   for (DataType::iterator iterator = data_.begin(); iterator != data_.end();
        ++iterator) {
     if (!iterator->second->deleted)
       write_batch->Put(iterator->first, iterator->second->value);
     else
       write_batch->Remove(iterator->first);
   }
 
   leveldb::Status s = db_->Write(*write_batch);
   if (s.ok()) {
     Clear();
     finished_ = true;
+    UMA_HISTOGRAM_TIMES("WebCore.IndexedDB.LevelDB.Transaction.CommitTime",
+                         base::TimeTicks::Now() - begin_time);
   }
   return s;
 }
 
 void LevelDBTransaction::Rollback() {
   DCHECK(!finished_);
   finished_ = true;
   Clear();
 }
 
@@ skipping 366 matching lines @@
 
   leveldb::Status s = db_->Write(*write_batch_);
   if (s.ok()) {
     finished_ = true;
     write_batch_->Clear();
   }
   return s;
 }
 
 }  // namespace content