OOPIF: History navigations for new child frames.

content/browser/frame_host/navigator.h

Index: content/browser/frame_host/navigator.h
diff --git a/content/browser/frame_host/navigator.h b/content/browser/frame_host/navigator.h
index 1768310d0cbc835dcb9cebb0935359715477240d..75cf2b0df84c0b857d52046442009c196a35c649 100644
--- a/content/browser/frame_host/navigator.h
+++ b/content/browser/frame_host/navigator.h
@@ -96,6 +96,14 @@ class CONTENT_EXPORT Navigator : public base::RefCounted<Navigator> {
       NavigationController::ReloadType reload_type,
       bool is_same_document_history_load);
 
+  // Called on a newly created subframe during a history navigation. The browser
+  // process looks up the corresponding FrameNavigationEntry for the new frame
+  // based on |unique_name| and navigates it in the correct process. This is
+  // only used in OOPIF-enabled modes.
+  virtual void NavigateNewChildFrame(
+      RenderFrameHostImpl* render_frame_host,
+      const std::string& unique_name) {}
+
   // Navigation requests -------------------------------------------------------
 
   virtual base::TimeTicks GetCurrentLoadStart();