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

chrome/browser/ui/browser_navigator.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/browser_navigator.h"
 
 #include <algorithm>
+#include <memory>
+#include <string>
 
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_about_handler.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/prerender/prerender_manager_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/tab_contents/tab_util.h"
 #include "chrome/browser/task_manager/web_contents_tags.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_instant_controller.h"
 #include "chrome/browser/ui/browser_navigator_params.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/location_bar/location_bar.h"
 #include "chrome/browser/ui/search/instant_search_prerenderer.h"
 #include "chrome/browser/ui/singleton_tabs.h"
 #include "chrome/browser/ui/status_bubble.h"
 #include "chrome/browser/ui/tab_helpers.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/url_constants.h"
 #include "components/prefs/pref_service.h"
 #include "content/public/browser/browser_url_handler.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/notification_service.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/features/features.h"
 
 #if defined(USE_ASH)
 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager.h"
 #include "components/signin/core/account_id/account_id.h"
 #endif
 
 #if defined(USE_AURA)
@@ skipping 302 matching lines @@
   }
 
  private:
   chrome::NavigateParams* params_;
   std::unique_ptr<WebContents> target_contents_owner_;
   DISALLOW_COPY_AND_ASSIGN(ScopedTargetContentsOwner);
 };
 
 content::WebContents* CreateTargetContents(const chrome::NavigateParams& params,
                                            const GURL& url) {
+  // If |params.opener| is present, then (initially) put the new contents in the
+  // same process as the opener.  Note that this is only "initial" placement
+  // (i.e. if subsequent navigation [including the initial navigation] triggers
+  // a cross-process transfer, then the opener and new contents can end up in
+  // separate processes).
+  scoped_refptr<content::SiteInstance> initial_site_instance_for_new_contents =
+      params.opener
+          ? params.opener->GetSiteInstance()
+          : tab_util::GetSiteInstanceForNewTab(params.browser->profile(), url);
+
   WebContents::CreateParams create_params(
-      params.browser->profile(),
-      params.source_site_instance && !params.force_new_process_for_new_contents
-          ? params.source_site_instance
-          : tab_util::GetSiteInstanceForNewTab(params.browser->profile(), url));
+      params.browser->profile(), initial_site_instance_for_new_contents);
   create_params.main_frame_name = params.frame_name;
+  if (params.opener) {
+    create_params.opener_render_frame_id = params.opener->GetRoutingID();
+    create_params.opener_render_process_id =
+        params.opener->GetProcess()->GetID();
+  }
   if (params.source_contents) {
     create_params.initial_size =
         params.source_contents->GetContainerBounds().size();
     create_params.created_with_opener = params.created_with_opener;
   }
   if (params.disposition == WindowOpenDisposition::NEW_BACKGROUND_TAB)
     create_params.initially_hidden = true;
 
 #if defined(USE_AURA)
   if (params.browser->window() &&
@@ skipping 91 matching lines @@
       }
     }
   }
 #endif
 
   // Navigate() must not return early after this point.
 
   if (GetSourceProfile(params) != params->browser->profile()) {
     // A tab is being opened from a link from a different profile, we must reset
     // source information that may cause state to be shared.
+    params->opener = nullptr;
     params->source_contents = nullptr;
     params->source_site_instance = nullptr;
     params->referrer = content::Referrer();
   }
 
   // Make sure the Browser is shown if params call for it.
   ScopedBrowserShower shower(params);
 
   // Makes sure any WebContents created by this function is destroyed if
   // not properly added to a tab strip.
@@ skipping 190 matching lines @@
   bool reverse_on_redirect = false;
   content::BrowserURLHandler::GetInstance()->RewriteURLIfNecessary(
       &rewritten_url, browser_context, &reverse_on_redirect);
 
   // Some URLs are mapped to uber subpages. Do not allow them in incognito.
   return !(rewritten_url.scheme_piece() == content::kChromeUIScheme &&
            rewritten_url.host_piece() == chrome::kChromeUIUberHost);
 }
 
 }  // namespace chrome