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diff --git a/content/child/indexed_db/proxy_webidbcursor_impl.h b/content/child/indexed_db/proxy_webidbcursor_impl.h
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+++ b/content/child/indexed_db/proxy_webidbcursor_impl.h
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+// 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_CHILD_INDEXED_DB_PROXY_WEBIDBCURSOR_IMPL_H_
+#define CONTENT_CHILD_INDEXED_DB_PROXY_WEBIDBCURSOR_IMPL_H_
+
+#include <deque>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/gtest_prod_util.h"
+#include "content/common/content_export.h"
+#include "content/common/indexed_db/indexed_db_key.h"
+#include "third_party/WebKit/public/platform/WebData.h"
+#include "third_party/WebKit/public/platform/WebIDBCallbacks.h"
+#include "third_party/WebKit/public/platform/WebIDBCursor.h"
+#include "third_party/WebKit/public/platform/WebIDBKey.h"
+
+namespace content {
+
+class CONTENT_EXPORT RendererWebIDBCursorImpl
+    : NON_EXPORTED_BASE(public WebKit::WebIDBCursor) {
+ public:
+  explicit RendererWebIDBCursorImpl(int32 ipc_cursor_id);
+  virtual ~RendererWebIDBCursorImpl();
+
+  virtual void advance(unsigned long count, WebKit::WebIDBCallbacks* callback);
+  virtual void continueFunction(const WebKit::WebIDBKey& key,
+                                WebKit::WebIDBCallbacks* callback);
+  virtual void postSuccessHandlerCallback();
+
+  void SetPrefetchData(const std::vector<IndexedDBKey>& keys,
+                       const std::vector<IndexedDBKey>& primary_keys,
+                       const std::vector<WebKit::WebData>& values);
+
+  void CachedContinue(WebKit::WebIDBCallbacks* callbacks);
+  void ResetPrefetchCache();
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(RendererWebIDBCursorImplTest, PrefetchTest);
+
+  int32 ipc_cursor_id_;
+
+  // Prefetch cache.
+  std::deque<IndexedDBKey> prefetch_keys_;
+  std::deque<IndexedDBKey> prefetch_primary_keys_;
+  std::deque<WebKit::WebData> prefetch_values_;
+
+  // Number of continue calls that would qualify for a pre-fetch.
+  int continue_count_;
+
+  // Number of items used from the last prefetch.
+  int used_prefetches_;
+
+  // Number of onsuccess handlers we are waiting for.
+  int pending_onsuccess_callbacks_;
+
+  // Number of items to request in next prefetch.
+  int prefetch_amount_;
+
+  enum { kInvalidCursorId = -1 };
+  enum { kPrefetchContinueThreshold = 2 };
+  enum { kMinPrefetchAmount = 5 };
+  enum { kMaxPrefetchAmount = 100 };
+};
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_INDEXED_DB_PROXY_WEBIDBCURSOR_IMPL_H_