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

chrome/browser/ui/browser_navigator_params.h

Index: chrome/browser/ui/browser_navigator_params.h
diff --git a/chrome/browser/ui/browser_navigator_params.h b/chrome/browser/ui/browser_navigator_params.h
index 10778a1b72218e577e24a66bf3e030c899ca8ee3..5236b5f4f429254eba22eae4a62439ea828ff2a4 100644
--- a/chrome/browser/ui/browser_navigator_params.h
+++ b/chrome/browser/ui/browser_navigator_params.h
@@ -23,6 +23,7 @@ class Browser;
 class Profile;
 
 namespace content {
+class RenderFrameHost;
 class WebContents;
 struct OpenURLParams;
 }
@@ -132,11 +133,9 @@ struct NavigateParams {
   // |tabstrip_add_types|.
   WindowOpenDisposition disposition;
 
-  // Controls creation of new web contents (in case |disposition| asks for a new
-  // tab or window).  If |force_new_process_for_new_contents| is true, then we
-  // try to put the new contents in a new renderer, even if they are same-site
-  // as |source_site_instance| (this is subject to renderer process limits).
-  bool force_new_process_for_new_contents;
+  // Allows setting the opener for the case when new WebContents are created
+  // (i.e. when |disposition| asks for a new tab or window).
+  content::RenderFrameHost* opener;
 
   // Sets browser->is_trusted_source. Default is false.
   bool trusted_source;