Proof of concept implementation of context based history filtering.

chrome/browser/history/history_tab_helper.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 CHROME_BROWSER_HISTORY_HISTORY_TAB_HELPER_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_TAB_HELPER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "content/public/browser/web_contents_observer.h"
@@ skipping 32 matching lines @@
   friend class content::WebContentsUserData<HistoryTabHelper>;
 
   // content::WebContentsObserver implementation.
   void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) override;
   void DidNavigateAnyFrame(content::RenderFrameHost* render_frame_host,
                            const content::LoadCommittedDetails& details,
                            const content::FrameNavigateParams& params) override;
   void TitleWasSet(content::NavigationEntry* entry, bool explicit_set) override;
+  void SetHistoryContext(content::NavigationEntry* entry, int context) override;
   void WebContentsDestroyed() override;
 
   // Helper function to return the history service.  May return NULL.
   history::HistoryService* GetHistoryService();
 
   // Whether we have a (non-empty) title for the current page.
   // Used to prevent subsequent title updates from affecting history. This
   // prevents some weirdness because some AJAXy apps use titles for status
   // messages.
   bool received_page_title_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryTabHelper);
 };
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_TAB_HELPER_H_