Allow showing pending URL for new tab navigations, but only if safe.

content/browser/web_contents/navigation_controller_impl.h

Index: content/browser/web_contents/navigation_controller_impl.h
diff --git a/content/browser/web_contents/navigation_controller_impl.h b/content/browser/web_contents/navigation_controller_impl.h
index 5027990f0f7b51a193b79a9341575fa54e75b239..175255ec5df87749c0d667bad9780af41d21db53 100644
--- a/content/browser/web_contents/navigation_controller_impl.h
+++ b/content/browser/web_contents/navigation_controller_impl.h
@@ -120,6 +120,10 @@ class CONTENT_EXPORT NavigationControllerImpl
 
   // For use by WebContentsImpl ------------------------------------------------
 
+  // Allow renderer-initiated navigations to create a pending entry when the
+  // provisional load starts.
+  void SetPendingEntry(content::NavigationEntryImpl* entry);
+
   // Handles updating the navigation state after the renderer has navigated.
   // This is used by the WebContentsImpl.
   //