Add IndexedDBValue wrapper class to group blob info with bits.

content/browser/indexed_db/indexed_db_value.cc

+// 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.
+
+#include "content/browser/indexed_db/indexed_db_value.h"
+
+#include "base/logging.h"
+
+namespace content {
+
+IndexedDBValue::IndexedDBValue() {}
+IndexedDBValue::IndexedDBValue(
+    const std::string& input_bits,
+    const std::vector<IndexedDBBlobInfo>& input_blob_info)
+    : bits(input_bits), blob_info(input_blob_info) {
+  DCHECK(!input_blob_info.size() || input_bits.size());
+}
+IndexedDBValue::~IndexedDBValue() {}
+
+}  // namespace content