Support window.opener after a process swap.

content/browser/site_instance.h

 // Copyright (c) 2011 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_SITE_INSTANCE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_SITE_INSTANCE_H_
 #pragma once
 
 #include "content/browser/renderer_host/render_process_host.h"
 #include "content/common/notification_observer.h"
@@ skipping 32 matching lines @@
 // rendered it.  Each RenderViewHost also points to the SiteInstance that it is
 // associated with.  A SiteInstance keeps track of the number of these
 // references and deletes itself when the count goes to zero.  This means that
 // a SiteInstance is only live as long as it is accessible, either from new
 // tabs with no NavigationEntries or in NavigationEntries in the history.
 //
 ///////////////////////////////////////////////////////////////////////////////
 class SiteInstance : public base::RefCounted<SiteInstance>,
                      public NotificationObserver {
  public:
+  // Returns a unique ID for this SiteInstance.
+  int32 id() { return id_; }
+
   // Get the BrowsingInstance to which this SiteInstance belongs.
   BrowsingInstance* browsing_instance() { return browsing_instance_; }
 
   // Sets the factory used to create new RenderProcessHosts. This will also be
   // passed on to SiteInstances spawned by this one.
   //
   // The factory must outlive the SiteInstance; ownership is not transferred. It
   // may be NULL, in which case the default BrowserRenderProcessHost will be
   // created (this is the behavior if you don't call this function).
   void set_render_process_host_factory(RenderProcessHostFactory* rph_factory) {
@@ skipping 92 matching lines @@
   // Returns the type of renderer process this instance belongs in, for grouping
   // purposes.
   RenderProcessHost::Type GetRendererType();
 
  private:
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
+  // The next available SiteInstance ID.
+  static int32 next_site_instance_id_;
+
+  // A unique ID for this SiteInstance.
+  int32 id_;
+
   NotificationRegistrar registrar_;
 
   // BrowsingInstance to which this SiteInstance belongs.
   scoped_refptr<BrowsingInstance> browsing_instance_;
 
   // Factory for new RenderProcessHosts, not owned by this class. NULL indiactes
   // that the default BrowserRenderProcessHost should be created.
   const RenderProcessHostFactory* render_process_host_factory_;
 
   // Current RenderProcessHost that is rendering pages for this SiteInstance.
@@ skipping 10 matching lines @@
   // The web site that this SiteInstance is rendering pages for.
   GURL site_;
 
   // Whether SetSite has been called.
   bool has_site_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteInstance);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_SITE_INSTANCE_H_