Proof of concept implementation of context based history filtering.

chrome/browser/history/history_tab_helper.cc

Index: chrome/browser/history/history_tab_helper.cc
diff --git a/chrome/browser/history/history_tab_helper.cc b/chrome/browser/history/history_tab_helper.cc
index 9d05f4ed2853c5f8d599037f666b9c1cca5556a9..9bca15acb20874938d153a386f9dd2c35dde4c55 100644
--- a/chrome/browser/history/history_tab_helper.cc
+++ b/chrome/browser/history/history_tab_helper.cc
@@ -137,6 +137,13 @@ void HistoryTabHelper::TitleWasSet(NavigationEntry* entry, bool explicit_set) {
   }
 }
 
+void HistoryTabHelper::SetHistoryContext(NavigationEntry* entry, int context) {
+  history::HistoryService* hs = GetHistoryService();
+  if (hs)
+    hs->SetPageHistoryContext(entry->GetVirtualURL(),
+                     static_cast<history::HistoryContext>(context));
+}
+
 history::HistoryService* HistoryTabHelper::GetHistoryService() {
   Profile* profile =
       Profile::FromBrowserContext(web_contents()->GetBrowserContext());