Use builders to convert between WebKit and content IDB types

content/child/indexed_db/indexed_db_key_builders.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_CHILD_INDEXED_DB_INDEXED_DB_KEY_BUILDERS_H_
+#define CONTENT_CHILD_INDEXED_DB_INDEXED_DB_KEY_BUILDERS_H_
+
+#include "content/common/content_export.h"
+#include "content/common/indexed_db/indexed_db_key.h"
+#include "content/common/indexed_db/indexed_db_key_path.h"
+#include "content/common/indexed_db/indexed_db_key_range.h"
+#include "third_party/WebKit/public/platform/WebIDBKey.h"
+#include "third_party/WebKit/public/platform/WebIDBKeyPath.h"
+#include "third_party/WebKit/public/platform/WebIDBKeyRange.h"
+
+namespace WebKit {
+class WebIDBKey;
+}
+
+namespace content {
+
+class CONTENT_EXPORT IndexedDBKeyBuilder {
+ public:
+  static IndexedDBKey Build(const WebKit::WebIDBKey& key);
+  static WebKit::WebIDBKey Build(const content::IndexedDBKey& key);

[darin (slow to review), 2013/07/19 04:12:08]

maybe this second one should be on a class named WebIDBKeyBuilder instead? 
since it builds a WebIDBKey?

+};
+
+class CONTENT_EXPORT IndexedDBKeyRangeBuilder {
+ public:
+  static IndexedDBKeyRange Build(const WebKit::WebIDBKeyRange& key_range);
+};
+
+class CONTENT_EXPORT IndexedDBKeyPathBuilder {
+ public:
+  static IndexedDBKeyPath Build(const WebKit::WebIDBKeyPath& key_path);
+  static WebKit::WebIDBKeyPath Build(const IndexedDBKeyPath& key_path);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_INDEXED_DB_INDEXED_DB_KEY_BUILDERS_H_