Proof of concept implementation of context based history filtering.

components/history/core/browser/history_service.cc

 // 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.
 
 // The history system runs on a background thread so that potentially slow
 // database operations don't delay the browser. This backend processing is
 // represented by HistoryBackend. The HistoryService's job is to dispatch to
 // that thread.
 //
 // Main thread                       History thread
@@ skipping 410 matching lines @@
 }
 
 void HistoryService::SetPageTitle(const GURL& url,
                                   const base::string16& title) {
   DCHECK(thread_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());
   ScheduleTask(PRIORITY_NORMAL, base::Bind(&HistoryBackend::SetPageTitle,
                                            history_backend_.get(), url, title));
 }
 
+void HistoryService::SetPageHistoryContext(const GURL& url,
+                                  HistoryContext context) {
+  DCHECK(thread_) << "History service being called after cleanup";
+  DCHECK(thread_checker_.CalledOnValidThread());
+  ScheduleTask(PRIORITY_NORMAL, base::Bind(&HistoryBackend::SetPageHistoryContext,
+                                           history_backend_.get(), url, context));
+}
 void HistoryService::UpdateWithPageEndTime(ContextID context_id,
                                            int nav_entry_id,
                                            const GURL& url,
                                            Time end_ts) {
   DCHECK(thread_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());
   ScheduleTask(
       PRIORITY_NORMAL,
       base::Bind(&HistoryBackend::UpdateWithPageEndTime, history_backend_.get(),
                  context_id, nav_entry_id, url, end_ts));
@@ skipping 677 matching lines @@
   return favicon_changed_callback_list_.Add(callback);
 }
 
 void HistoryService::NotifyFaviconChanged(
     const std::set<GURL>& changed_favicons) {
   DCHECK(thread_checker_.CalledOnValidThread());
   favicon_changed_callback_list_.Notify(changed_favicons);
 }
 
 }  // namespace history