[IndexedDB] Adding txn, value, and key size metrics

content/browser/indexed_db/leveldb/leveldb_transaction.h

 // 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.
 
 #ifndef CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_TRANSACTION_H_
 #define CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_TRANSACTION_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 22 matching lines @@
                               bool upper_open);
 
   virtual leveldb::Status Get(const base::StringPiece& key,
                               std::string* value,
                               bool* found);
   virtual leveldb::Status Commit();
   void Rollback();
 
   std::unique_ptr<LevelDBIterator> CreateIterator();
 
+  uint64_t GetTransactionSize() const { return size_; }
+
  protected:
   virtual ~LevelDBTransaction();
   explicit LevelDBTransaction(LevelDBDatabase* db);
   friend class IndexedDBClassFactory;
 
  private:
   friend class base::RefCounted<LevelDBTransaction>;
   friend class LevelDBTransactionRangeTest;
   friend class LevelDBTransactionTest;
   FRIEND_TEST_ALL_PREFIXES(LevelDBTransactionTest, GetAndPut);
@@ skipping 104 matching lines @@
   void Set(const base::StringPiece& key, std::string* value, bool deleted);
   void RegisterIterator(TransactionIterator* iterator);
   void UnregisterIterator(TransactionIterator* iterator);
   void NotifyIterators();
 
   LevelDBDatabase* db_;
   const LevelDBSnapshot snapshot_;
   const LevelDBComparator* comparator_;
   Comparator data_comparator_;
   DataType data_;
+  uint64_t size_ = 0ull;
   bool finished_ = false;
   std::set<TransactionIterator*> iterators_;
 
   DISALLOW_COPY_AND_ASSIGN(LevelDBTransaction);
 };
 
 // Reads go straight to the database, ignoring any writes cached in
 // write_batch_, and writes are write-through, without consolidation.
 class LevelDBDirectTransaction {
  public:
@@ skipping 13 matching lines @@
   LevelDBDatabase* db_;
   std::unique_ptr<LevelDBWriteBatch> write_batch_;
   bool finished_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(LevelDBDirectTransaction);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_TRANSACTION_H_