InstantExtended: Transient naventry for preview.

chrome/browser/instant/instant_overlay.h

Index: chrome/browser/instant/instant_overlay.h
diff --git a/chrome/browser/instant/instant_overlay.h b/chrome/browser/instant/instant_overlay.h
index 99b7c2e385ae5de38cdb3b3d443d9e9cc051d983..8df72748ed1fe6a896d4abf9d685a4b9f45831cc 100644
--- a/chrome/browser/instant/instant_overlay.h
+++ b/chrome/browser/instant/instant_overlay.h
@@ -57,6 +57,11 @@ class InstantOverlay : public InstantPage,
     return is_pointer_down_from_activate_;
   }
 
+  // Returns the initial navigation entry for the most recently loaded URL.
+  const content::NavigationEntry* base_navigation_entry() {
+    return loader_.base_navigation_entry();
+  }
+
   // Returns info about the last navigation by the Instant page. If the page
   // hasn't navigated since the last Update(), the URL is empty.
   const history::HistoryAddPageArgs& last_navigation() const {