Check BrowsingInstance before swapping prerenders.

chrome/browser/prerender/prerender_manager.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/prerender/prerender_manager.h"
 
 #include <algorithm>
 #include <functional>
 #include <string>
 #include <vector>
@@ skipping 40 matching lines @@
 #include "chrome/common/prerender_types.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/devtools_agent_host.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.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/session_storage_namespace.h"
+#include "content/public/browser/site_instance.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/common/url_constants.h"
 #include "extensions/common/constants.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_getter.h"
 
 using content::BrowserThread;
@@ skipping 50 matching lines @@
       final_status != FINAL_STATUS_TIMED_OUT &&
       final_status != FINAL_STATUS_MANAGER_SHUTDOWN &&
       final_status != FINAL_STATUS_PROFILE_DESTROYED &&
       final_status != FINAL_STATUS_APP_TERMINATING &&
       final_status != FINAL_STATUS_WINDOW_OPENER &&
       final_status != FINAL_STATUS_CACHE_OR_HISTORY_CLEARED &&
       final_status != FINAL_STATUS_CANCELLED &&
       final_status != FINAL_STATUS_DEVTOOLS_ATTACHED &&
       final_status != FINAL_STATUS_CROSS_SITE_NAVIGATION_PENDING &&
       final_status != FINAL_STATUS_PAGE_BEING_CAPTURED &&
-      final_status != FINAL_STATUS_NAVIGATION_UNCOMMITTED;
+      final_status != FINAL_STATUS_NAVIGATION_UNCOMMITTED &&
+      final_status != FINAL_STATUS_NON_EMPTY_BROWSING_INSTANCE;
 }
 
 void CheckIfCookiesExistForDomainResultOnUIThread(
     const net::CookieMonster::HasCookiesForETLDP1Callback& callback,
     bool cookies_exist) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   callback.Run(cookies_exist);
 }
 
 void CheckIfCookiesExistForDomainResultOnIOThread(
@@ skipping 388 matching lines @@
     // there is a pending entry, it may not commit.
     // TODO(creis): If there is a pending navigation and no last committed
     // entry, we might be able to transfer the network request instead.
     if (!new_web_contents->GetController().CanPruneAllButLastCommitted()) {
       // Abort this prerender so it is not used later. http://crbug.com/292121
       prerender_data->contents()->Destroy(FINAL_STATUS_NAVIGATION_UNCOMMITTED);
       return NULL;
     }
   }
 
+  // Do not swap if the target WebContents is not the only WebContents in its
+  // current BrowsingInstance.
+  if (web_contents->GetSiteInstance()->GetRelatedActiveContentsCount() != 1u) {
+    DCHECK_GT(
+        web_contents->GetSiteInstance()->GetRelatedActiveContentsCount(), 1u);
+    prerender_data->contents()->Destroy(
+        FINAL_STATUS_NON_EMPTY_BROWSING_INSTANCE);
+    return NULL;
+  }
+
   // Do not use the prerendered version if there is an opener object.
   if (web_contents->HasOpener()) {
     prerender_data->contents()->Destroy(FINAL_STATUS_WINDOW_OPENER);
     return NULL;
   }
 
   // Do not swap in the prerender if the current WebContents is being captured.
   if (web_contents->GetCapturerCount() > 0) {
     prerender_data->contents()->Destroy(FINAL_STATUS_PAGE_BEING_CAPTURED);
     return NULL;
@@ skipping 1343 matching lines @@
     content::RenderProcessHost* host) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   prerender_process_hosts_.erase(host);
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&PrerenderTracker::RemovePrerenderCookieStoreOnIOThread,
                  base::Unretained(prerender_tracker()), host->GetID(), false));
 }
 
 }  // namespace prerender