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

content/browser/indexed_db/indexed_db_fake_backing_store.h

 // Copyright 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_INDEXED_DB_FAKE_BACKING_STORE_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FAKE_BACKING_STORE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 129 matching lines @@
                                           const IndexedDBKeyRange& key_range,
                                           blink::WebIDBCursorDirection,
                                           leveldb::Status*) override;
 
   class FakeTransaction : public IndexedDBBackingStore::Transaction {
    public:
     explicit FakeTransaction(leveldb::Status phase_two_result);
     void Begin() override;
     leveldb::Status CommitPhaseOne(scoped_refptr<BlobWriteCallback>) override;
     leveldb::Status CommitPhaseTwo() override;
+    uint64_t GetTransactionSize() override;
     void Rollback() override;
 
    private:
     leveldb::Status result_;
 
     DISALLOW_COPY_AND_ASSIGN(FakeTransaction);
   };
 
  protected:
   friend class base::RefCounted<IndexedDBFakeBackingStore>;
   ~IndexedDBFakeBackingStore() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(IndexedDBFakeBackingStore);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FAKE_BACKING_STORE_H_