Use WebIDBKeyPath type in WebKit API, implement IndexedDBKeyPath type.

content/common/indexed_db/indexed_db_key_path.h

+// Copyright (c) 2012 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_COMMON_INDEXED_DB_INDEXED_DB_KEY_PATH_H_
+#define CONTENT_COMMON_INDEXED_DB_INDEXED_DB_KEY_PATH_H_
+#pragma once
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/string16.h"
+#include "content/common/content_export.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBKeyPath.h"
+
+class CONTENT_EXPORT IndexedDBKeyPath {

[jam, 2012/04/30 16:01:29]

nit: please put this in the "content" namespace, that's where all new code in
content should go (and we need to migrate existing code)

[jsbell, 2012/04/30 18:08:23]

Done.

+ public:
+  IndexedDBKeyPath();  // Defaults to WebKit::WebIDBKeyPath::NullType.
+  explicit IndexedDBKeyPath(const WebKit::WebIDBKeyPath& keyPath);
+  ~IndexedDBKeyPath();
+
+  void SetNull();
+  void SetArray(const std::vector<string16>& array);
+  void SetString(const string16& string);
+  void Set(const WebKit::WebIDBKeyPath& key);
+
+  bool IsValid() const;
+
+  WebKit::WebIDBKeyPath::Type type() const { return type_; }
+  const std::vector<string16>& array() const { return array_; }
+  const string16& string() const { return string_; }
+
+  operator WebKit::WebIDBKeyPath() const;
+
+ private:
+  WebKit::WebIDBKeyPath::Type type_;
+  std::vector<string16> array_;
+  string16 string_;
+};
+
+#endif  // CONTENT_COMMON_INDEXED_DB_INDEXED_DB_KEY_PATH_H_