Keep browser process alive while there are platform apps with background pages running.

chrome/browser/sync/test/integration/apps_helper.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/sync/test/integration/apps_helper.h"
 
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
+#include "chrome/browser/extensions/extension_process_manager.h"
+#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync/test/integration/sync_app_helper.h"
 #include "chrome/browser/sync/test/integration/sync_datatype_helper.h"
 #include "chrome/browser/sync/test/integration/sync_extension_helper.h"
 #include "chrome/common/extensions/extension.h"
+#include "content/public/test/test_utils.h"
 
 using sync_datatype_helper::test;
 
 namespace {
 
 std::string CreateFakeAppName(int index) {
   return "fakeapp" + base::IntToString(index);
 }
 
+void WaitForPlatformAppsToUnloadForProfile(Profile* profile) {
+  // Note this will hang if there are extensions with persistent background
+  // pages loaded.
+  ExtensionProcessManager* pm =
+      extensions::ExtensionSystem::Get(profile)->process_manager();
+  while (!pm->background_hosts().empty()) {
+    content::WindowedNotificationObserver destroyed_observer(
+        chrome::NOTIFICATION_EXTENSION_HOST_DESTROYED,
+        content::NotificationService::AllSources());
+    destroyed_observer.Wait();
+  }
+}
+
 }  // namespace
 
 namespace apps_helper {
 
 bool HasSameAppsAsVerifier(int index) {
   return SyncAppHelper::GetInstance()->AppStatesMatch(
       test()->GetProfile(index), test()->verifier());
 }
 
 bool AllProfilesHaveSameAppsAsVerifier() {
@@ skipping 86 matching lines @@
 void CopyNTPOrdinals(Profile* source, Profile* destination, int index) {
   SetPageOrdinalForApp(destination, index, GetPageOrdinalForApp(source, index));
   SetAppLaunchOrdinalForApp(
       destination, index, GetAppLaunchOrdinalForApp(source, index));
 }
 
 void FixNTPOrdinalCollisions(Profile* profile) {
   SyncAppHelper::GetInstance()->FixNTPOrdinalCollisions(profile);
 }
 
+void WaitForPlatformAppsToUnload() {
+  // First run any pending tasks to allow any about to load background
+  // pages to load.
+  MessageLoop::current()->RunUntilIdle();
+  for (int i = 0; i < test()->num_clients(); ++i)
+    WaitForPlatformAppsToUnloadForProfile(test()->GetProfile(i));
+  WaitForPlatformAppsToUnloadForProfile(test()->verifier());
+}
+
 }  // namespace apps_helper