Don't close background pages if there is a pending response (callback).

chrome/browser/extensions/extension_process_manager.cc

 // 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.
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 
 #include "chrome/browser/ui/browser_window.h"
 #include "content/browser/browsing_instance.h"
+#include "chrome/browser/extensions/extension_event_router.h"
 #if defined(OS_MACOSX)
 #include "chrome/browser/extensions/extension_host_mac.h"
 #endif
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_info_map.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 401 matching lines @@
 SiteInstance* ExtensionProcessManager::GetSiteInstanceForURL(const GURL& url) {
   return browsing_instance_->GetSiteInstanceForURL(url);
 }
 
 bool ExtensionProcessManager::HasExtensionHost(ExtensionHost* host) const {
   return all_hosts_.find(host) != all_hosts_.end();
 }
 
 void ExtensionProcessManager::OnExtensionIdle(const std::string& extension_id) {
   ExtensionHost* host = GetBackgroundHostForExtension(extension_id);
-  if (host && !HasVisibleViews(extension_id))
-    CloseBackgroundHost(host);
+  if (host && !HasVisibleViews(extension_id)) {
+    Profile* profile =
+        Profile::FromBrowserContext(browsing_instance_->browser_context());
+    if (!profile->GetExtensionEventRouter()->HasInFlightEvents(extension_id))
+      CloseBackgroundHost(host);
+  }
 }
 
 bool ExtensionProcessManager::HasVisibleViews(const std::string& extension_id) {
   const std::set<RenderViewHost*>& views =
       GetRenderViewHostsForExtension(extension_id);
   for (std::set<RenderViewHost*>::const_iterator it = views.begin();
        it != views.end(); ++it) {
     const RenderViewHost* host = *it;
     if (host->site_instance()->site().host() == extension_id &&
         host->delegate()->GetRenderViewType() !=
@@ skipping 226 matching lines @@
         if (service && service->is_ready())
           CreateBackgroundHostsForProfileStartup(this, service->extensions());
       }
       break;
     }
     default:
       ExtensionProcessManager::Observe(type, source, details);
       break;
   }
 }