OOPIF: History navigations for new child frames.

content/browser/frame_host/navigation_entry_impl.h

Index: content/browser/frame_host/navigation_entry_impl.h
diff --git a/content/browser/frame_host/navigation_entry_impl.h b/content/browser/frame_host/navigation_entry_impl.h
index 051a3ba909f524b31fa1385bbff4774379f73c74..8d97ef39871055859583b4c36a48b7e4d78c0423 100644
--- a/content/browser/frame_host/navigation_entry_impl.h
+++ b/content/browser/frame_host/navigation_entry_impl.h
@@ -192,6 +192,15 @@ class CONTENT_EXPORT NavigationEntryImpl
   // there is one in this NavigationEntry.
   FrameNavigationEntry* GetFrameEntry(FrameTreeNode* frame_tree_node) const;
 
+  // Returns the FrameNavigationEntry corresponding to the frame with the given
+  // |unique_name|, if any. This is useful when the FrameTreeNode cannot be used
+  // to find the entry, such as for a newly created subframe in a history
+  // navigation. Callers should update the FrameTreeNode ID of the entry so that
+  // it can be found with |GetFrameEntry| above.
+  // TODO(creis): Generate or verify the unique_name in the browser process.
+  FrameNavigationEntry* GetFrameEntryByUniqueName(
+      const std::string& unique_name) const;
+
   void set_unique_id(int unique_id) {
     unique_id_ = unique_id;
   }