Add IndexedDBValue wrapper class to group blob info with bits.

content/browser/indexed_db/indexed_db_value.h

+// Copyright (c) 2014 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_VALUE_H_
+#define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_VALUE_H_
+
+#include <vector>
+#include "content/browser/indexed_db/indexed_db_blob_info.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+struct CONTENT_EXPORT IndexedDBValue {
+  IndexedDBValue();
+  IndexedDBValue(const std::string& input_bits,
+                 const std::vector<IndexedDBBlobInfo>& input_blob_info);
+  ~IndexedDBValue();
+
+  void swap(IndexedDBValue& value) {
+    bits.swap(value.bits);
+    blob_info.swap(value.blob_info);
+  }
+
+  bool empty() const { return bits.empty(); }
+  void clear() {
+    bits.clear();
+    blob_info.clear();
+  }
+
+  size_t SizeEstimate() const {
+    return bits.size() + blob_info.size() * sizeof(IndexedDBBlobInfo);
+  }
+
+  std::string bits;
+  std::vector<IndexedDBBlobInfo> blob_info;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_VALUE_H_