mojo: allow BackgroundServiceLoader-loaded apps to Quit themselves.

mojo/service_manager/background_service_loader.h

-// Copyright 2014 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 MOJO_SERVICE_MANAGER_BACKGROUND_SERVICE_LOADER_H_
-#define MOJO_SERVICE_MANAGER_BACKGROUND_SERVICE_LOADER_H_
-
-#include "base/memory/scoped_ptr.h"
-#include "base/message_loop/message_loop.h"
-#include "base/threading/thread.h"
-#include "mojo/service_manager/service_loader.h"
-
-namespace mojo {
-
-class ServiceManager;
-
-// ServiceLoader implementation that creates a background thread and issues load
-// requests there.
-class MOJO_SERVICE_MANAGER_EXPORT BackgroundServiceLoader
-    : public ServiceLoader {
- public:
-  BackgroundServiceLoader(scoped_ptr<ServiceLoader> real_loader,
-                          const char* thread_name,
-                          base::MessageLoop::Type message_loop_type);
-  virtual ~BackgroundServiceLoader();
-
-  // ServiceLoader overrides:
-  virtual void LoadService(ServiceManager* manager,
-                           const GURL& url,
-                           ScopedMessagePipeHandle shell_handle) OVERRIDE;
-  virtual void OnServiceError(ServiceManager* manager,
-                              const GURL& url) OVERRIDE;
-
- private:
-  class BackgroundLoader;
-
-  // These functions are exected on the background thread. They call through
-  // to |background_loader_| to do the actual loading.
-  // TODO: having this code take a |manager| is fragile (as ServiceManager isn't
-  // thread safe).
-  void LoadServiceOnBackgroundThread(
-      ServiceManager* manager,
-      const GURL& url,
-      ScopedMessagePipeHandle* shell_handle);
-  void OnServiceErrorOnBackgroundThread(ServiceManager* manager,
-                                        const GURL& url);
-  void ShutdownOnBackgroundThread();
-
-  scoped_ptr<ServiceLoader> loader_;
-  base::Thread thread_;
-  base::MessageLoop::Type message_loop_type_;
-
-  // Lives on |thread_|. Trivial interface that calls through to |loader_|.
-  BackgroundLoader* background_loader_;
-
-  DISALLOW_COPY_AND_ASSIGN(BackgroundServiceLoader);
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_SERVICE_MANAGER_BACKGROUND_SERVICE_LOADER_H_