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diff --git a/chrome/browser/dom_ui/history2_ui.h b/chrome/browser/dom_ui/history2_ui.h
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+++ b/chrome/browser/dom_ui/history2_ui.h
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+// Copyright (c) 2010 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 CHROME_BROWSER_DOM_UI_HISTORY2_UI_H_
+#define CHROME_BROWSER_DOM_UI_HISTORY2_UI_H_
+
+#include <string>
+#include <vector>
+
+#include "base/string16.h"
+#include "chrome/browser/dom_ui/chrome_url_data_manager.h"
+#include "chrome/browser/dom_ui/dom_ui.h"
+#include "chrome/browser/cancelable_request.h"
+#include "chrome/browser/history/history.h"
+#include "chrome/common/notification_registrar.h"
+
+class GURL;
+
+// Temporary fork for development of new history UI.
+// TODO(pamg): merge back in when new UI is complete.
+
+class HistoryUIHTMLSource2 : public ChromeURLDataManager::DataSource {
+ public:
+  HistoryUIHTMLSource2();
+
+  // Called when the network layer has requested a resource underneath
+  // the path we registered.
+  virtual void StartDataRequest(const std::string& path,
+                                bool is_off_the_record,
+                                int request_id);
+
+  virtual std::string GetMimeType(const std::string&) const {
+    return "text/html";
+  }
+
+ private:
+  ~HistoryUIHTMLSource2() {}
+
+  DISALLOW_COPY_AND_ASSIGN(HistoryUIHTMLSource2);
+};
+
+// The handler for Javascript messages related to the "history" view.
+class BrowsingHistoryHandler2 : public DOMMessageHandler,
+                                public NotificationObserver {
+ public:
+  BrowsingHistoryHandler2();
+  virtual ~BrowsingHistoryHandler2();
+
+  // DOMMessageHandler implementation.
+  virtual DOMMessageHandler* Attach(DOMUI* dom_ui);
+  virtual void RegisterMessages();
+
+  // Callback for the "getHistory" message.
+  void HandleGetHistory(const Value* value);
+
+  // Callback for the "searchHistory" message.
+  void HandleSearchHistory(const Value* value);
+
+  // Callback for the "removeURLsOnOneDay" message.
+  void HandleRemoveURLsOnOneDay(const Value* value);
+
+  // Handle for "clearBrowsingData" message.
+  void HandleClearBrowsingData(const Value* value);
+
+  // NotificationObserver implementation.
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+ private:
+  // Callback from the history system when the history list is available.
+  void QueryComplete(HistoryService::Handle request_handle,
+                     history::QueryResults* results);
+
+  // Callback from the history system when visits were deleted.
+  void RemoveComplete();
+
+  // Extract the arguments from the call to HandleSearchHistory.
+  void ExtractSearchHistoryArguments(const Value* value,
+                                     int* month,
+                                     string16* query);
+
+  // Figure out the query options for a month-wide query.
+  history::QueryOptions CreateMonthQueryOptions(int month);
+
+  NotificationRegistrar registrar_;
+
+  // Current search text.
+  string16 search_text_;
+
+  // Our consumer for search requests to the history service.
+  CancelableRequestConsumerT<int, 0> cancelable_search_consumer_;
+
+  // Our consumer for delete requests to the history service.
+  CancelableRequestConsumerT<int, 0> cancelable_delete_consumer_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowsingHistoryHandler2);
+};
+
+class HistoryUI2 : public DOMUI {
+ public:
+  explicit HistoryUI2(TabContents* contents);
+
+  // Return the URL for a given search term.
+  static const GURL GetHistoryURLWithSearchText(const string16& text);
+
+  static RefCountedMemory* GetFaviconResourceBytes();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(HistoryUI2);
+};
+
+#endif  // CHROME_BROWSER_DOM_UI_HISTORY2_UI_H_