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 92ee8aff42b931ea10449514535b4031fd6761e1..f55f28c652d2698a61218c6534065699deba0fb5 100644
--- a/content/browser/web_contents/navigation_controller_impl.h
+++ b/content/browser/web_contents/navigation_controller_impl.h
@@ -121,6 +121,10 @@ 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.
   //