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diff --git a/chrome/browser/history/query_parser.h b/chrome/browser/history/query_parser.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// The query parser is used to parse queries entered into the history
+// search into more normalized queries can be passed to the SQLite backend.
+
+#ifndef CHROME_BROWSER_HISTORY_QUERY_PARSER_H__
+#define CHROME_BROWSER_HISTORY_QUERY_PARSER_H__
+
+#include <set>
+#include <vector>
+
+class QueryNodeList;
+
+// QueryNode is used by QueryNodeParser to represent the elements that
+// constitute a query. While QueryNode is exposed by way of ParseQuery, it
+// really isn't meant for external usage.
+class QueryNode {
+ public:
+  virtual ~QueryNode() {}
+
+  // Serialize ourselves out to a string that can be passed to SQLite. Returns
+  // the number of words in this node.
+  virtual int AppendToSQLiteQuery(std::wstring* query) const = 0;
+
+  // Return true if this is a word node, false if it's a QueryNodeList.
+  virtual bool IsWord() const = 0;
+
+  // Returns true if this node matches the specified text. If exact is true,
+  // the string must exactly match. Otherwise, this uses a starts with
+  // comparison.
+  virtual bool Matches(const std::wstring& word, bool exact) const = 0;
+
+  // Returns true if this node matches at least one of the words in words.
+  virtual bool HasMatchIn(const std::vector<std::wstring>& words) const = 0;
+};
+
+
+class QueryParser {
+ public:
+  QueryParser();
+
+  // Parse a query into a SQLite query. The resulting query is placed in
+  // sqlite_query and the number of words is returned.
+  int ParseQuery(const std::wstring& query,
+                 std::wstring* sqlite_query);
+
+  // Parses the query words in query, returning the nodes that constitute the
+  // valid words in the query. This is intended for later usage with
+  // DoesQueryMatch.
+  // Ownership of the nodes passes to the caller.
+  void ParseQuery(const std::wstring& query,
+                  std::vector<QueryNode*>* nodes);
+
+  // Returns true if the string text matches the query nodes created by a call
+  // to ParseQuery.
+  bool DoesQueryMatch(const std::wstring& text,
+                      const std::vector<QueryNode*>& nodes);
+
+ private:
+  // Does the work of parsing a query; creates nodes in QueryNodeList as
+  // appropriate. This is invoked from both of the ParseQuery methods.
+  bool ParseQueryImpl(const std::wstring& query,
+                      QueryNodeList* root);
+
+  // Extracts the words from text, placing each word into words.
+  void ExtractWords(const std::wstring& text,
+                    std::vector<std::wstring>* words);
+};
+
+#endif  // CHROME_BROWSER_HISTORY_QUERY_PARSER_H__