Proof of concept implementation of context based history filtering.

components/history/core/browser/history_backend.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 COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_BACKEND_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_BACKEND_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 182 matching lines @@
   void PersistState();
 #endif
 
   void ClearCachedDataForContextID(ContextID context_id);
 
   // Navigation ----------------------------------------------------------------
 
   // |request.time| must be unique with high probability.
   void AddPage(const HistoryAddPageArgs& request);
   virtual void SetPageTitle(const GURL& url, const base::string16& title);
+  virtual void SetPageHistoryContext(const GURL& url, HistoryContext context);
   void AddPageNoVisitForBookmark(const GURL& url, const base::string16& title);
   void UpdateWithPageEndTime(ContextID context_id,
                              int nav_entry_id,
                              const GURL& url,
                              base::Time end_ts);
 
   // Querying ------------------------------------------------------------------
 
   // Run the |callback| on the History thread.
   // |callback| should handle the null database case.
@@ skipping 601 matching lines @@
 
   // List of observers
   ObserverList<HistoryBackendObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryBackend);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_BACKEND_H_