Restart running apps when chrome restarts.

chrome/browser/sessions/app_restore_service.cc

Index: chrome/browser/sessions/app_restore_service.cc
diff --git a/chrome/browser/sessions/app_restore_service.cc b/chrome/browser/sessions/app_restore_service.cc
new file mode 100644
index 0000000000000000000000000000000000000000..50b6d1336eda244d22be6ba65bfc2aede8b7967d
--- /dev/null
+++ b/chrome/browser/sessions/app_restore_service.cc
@@ -0,0 +1,110 @@
+// 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/sessions/app_restore_service.h"
+
+#include "chrome/browser/extensions/api/app_runtime/app_runtime_api.h"
+#include "chrome/browser/extensions/event_router.h"
+#include "chrome/browser/extensions/extension_host.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/extension_system.h"
+#include "chrome/browser/prefs/pref_service.h"
+#include "chrome/browser/prefs/scoped_user_pref_update.h"
+#include "chrome/common/extensions/extension.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/pref_names.h"
+#include "content/public/browser/notification_details.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_types.h"
+
+AppRestoreService::AppRestoreService(Profile* profile)
+    : profile_(profile) {
+  registrar_.Add(
+      this, chrome::NOTIFICATION_EXTENSION_HOST_DID_STOP_LOADING,
+      content::NotificationService::AllSources());
+  registrar_.Add(
+      this, chrome::NOTIFICATION_EXTENSION_HOST_DESTROYED,
+      content::NotificationService::AllSources());
+  registrar_.Add(
+      this, content::NOTIFICATION_APP_TERMINATING,
+      content::NotificationService::AllSources());
+}
+
+void AppRestoreService::RestoreApps() {
+  const base::Value* running_apps =
+      profile_->GetPrefs()->GetUserPrefValue(prefs::kAppsRunningAtShutdown);
+  if (!running_apps)
+    return;
+  const base::ListValue* running_apps_list = NULL;
+  running_apps->GetAsList(&running_apps_list);
+  for (size_t i = 0; i < running_apps_list->GetSize(); i++) {
+    std::string extension_id;
+    running_apps_list->GetString(i, &extension_id);
+
+    // TODO(koz): As event dispatch occurs asynchronously the order of windows
+    // created in response to the onRestarted event is not stable, which means
+    // that the alt-tab order of windows won't remain constant over restarts.
+    // This can be fixed by acking each event before dispatching the next one.
+    RestoreApp(extension_id);
+  }
+  profile_->GetPrefs()->ClearPref(prefs::kAppsRunningAtShutdown);
+}
+
+void AppRestoreService::Observe(int type,
+                                const content::NotificationSource& source,
+                                const content::NotificationDetails& details) {
+  switch (type) {
+    case chrome::NOTIFICATION_EXTENSION_HOST_DID_STOP_LOADING: {
+      extensions::ExtensionHost* host =
+          content::Details<extensions::ExtensionHost>(details).ptr();
+      if (host->extension()->is_platform_app()) {
+        RecordAppStart(host->extension()->id());
+      }
+      break;
+    }
+
+    case chrome::NOTIFICATION_EXTENSION_HOST_DESTROYED: {
+      extensions::ExtensionHost* host =
+          content::Details<extensions::ExtensionHost>(details).ptr();
+      if (host->extension()->is_platform_app()) {
+        RecordAppStop(host->extension()->id());
+      }
+      break;
+    }
+
+    case content::NOTIFICATION_APP_TERMINATING: {
+      // Stop listening to NOTIFICATION_EXTENSION_HOST_DESTROYED in particular
+      // as all extension hosts will be destroyed as a result of shutdown.
+      registrar_.RemoveAll();
+      break;
+    }
+  }
+}
+
+// static
+void AppRestoreService::RegisterUserPrefs(PrefService* pref_service) {
+  pref_service->RegisterListPref(prefs::kAppsRunningAtShutdown,
+                                 PrefService::UNSYNCABLE_PREF);
+}
+
+void AppRestoreService::RecordAppStart(const std::string& extension_id) {
+  ListPrefUpdate pref_update(profile_->GetPrefs(),
+                             prefs::kAppsRunningAtShutdown);
+  base::ListValue* apps = pref_update.Get();
+  apps->AppendIfNotPresent(base::Value::CreateStringValue(extension_id));
+}
+
+void AppRestoreService::RecordAppStop(const std::string& extension_id) {
+  ListPrefUpdate pref_update(profile_->GetPrefs(),
+                             prefs::kAppsRunningAtShutdown);
+  base::StringValue to_remove(extension_id);
+  pref_update.Get()->Remove(to_remove, NULL);
+}
+
+void AppRestoreService::RestoreApp(const std::string& extension_id) {
+  const extensions::Extension* extension =
+      extensions::ExtensionSystem::Get(profile_)->extension_service()->
+      extensions()->GetByID(extension_id);
+  extensions::AppEventRouter::DispatchOnRestartEvent(profile_, extension);
+}