NOT YET READY: Making chrome.windows.create establish an actual "opener" relationship.

chrome/browser/extensions/api/tabs/tabs_api.cc

Index: chrome/browser/extensions/api/tabs/tabs_api.cc
diff --git a/chrome/browser/extensions/api/tabs/tabs_api.cc b/chrome/browser/extensions/api/tabs/tabs_api.cc
index a3b16919c5a6d9bc840574dac92ec7706a7622ca..b7f333d193c3b6a50957e6a583dd7d1773601f85 100644
--- a/chrome/browser/extensions/api/tabs/tabs_api.cc
+++ b/chrome/browser/extensions/api/tabs/tabs_api.cc
@@ -571,13 +571,10 @@ ExtensionFunction::ResponseAction WindowsCreateFunction::Run() {
                                            ui::PAGE_TRANSITION_LINK);
     navigate_params.disposition = WindowOpenDisposition::NEW_FOREGROUND_TAB;
 
-    // The next 2 statements put the new contents in the same BrowsingInstance
-    // as their opener.  Note that |force_new_process_for_new_contents = false|
-    // means that new contents might still end up in a new renderer
-    // (if they open a web URL and are transferred out of an extension
-    // renderer), but even in this case the flags below ensure findability via
-    // window.open.
-    navigate_params.force_new_process_for_new_contents = false;
+    // Put the new contents in the same BrowsingInstance as their opener.
+    bool set_self_as_opener = create_data->set_self_as_opener &&  // present?
+                              *create_data->set_self_as_opener;  // set to true?
+    navigate_params.opener = set_self_as_opener ? render_frame_host() : nullptr;
     navigate_params.source_site_instance =
         render_frame_host()->GetSiteInstance();