Changes to add duration into history database.

chrome/browser/history/history.h

Index: chrome/browser/history/history.h
diff --git a/chrome/browser/history/history.h b/chrome/browser/history/history.h
index 230eb4f419eb81ee26c3aff0a032fd58420561f3..cab3f140262d50b6bb264726712249a98e1d609d 100644
--- a/chrome/browser/history/history.h
+++ b/chrome/browser/history/history.h
@@ -220,6 +220,18 @@ class HistoryService : public CancelableRequestProvider,
   // title in the full text index.
   void SetPageTitle(const GURL& url, const string16& title);
 
+  // Updates the history database with more information about a page.
+  // Right now, we only update with a page's ending time stamp information.
+  // The page can be identified by the combination of the pointer to
+  // a RenderProcessHost, the page id and the url.
+  //
+  // The given pointer will not be dereferenced, it is only used for
+  // identification purposes, hence it is a void*.
+  void UpdateDBWithPageInfo(const void* host,
+                            int32 page_id,
+                            const GURL& url,
+                            const base::Time end_ts);
+
   // Indexing ------------------------------------------------------------------
 
   // Notifies history of the body text of the given recently-visited URL.