media: Quit MojoMediaApplication when no service is bound.

mojo/application/public/cpp/app_lifetime_helper.h

 // Copyright 2015 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_APPLICATION_PUBLIC_CPP_APP_LIFETIME_HELPER_H_
 #define MOJO_APPLICATION_PUBLIC_CPP_APP_LIFETIME_HELPER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 16 matching lines @@
   // When a service creates another object that is held by the client, it should
   // also vend to it a refcount using this method. That way if the caller stops
   // holding on to the service but keeps the reference to the object, the app is
   // still alive.
   scoped_ptr<AppRefCount> Clone();
 
  private:
   friend AppLifetimeHelper;
 
   AppRefCount(AppLifetimeHelper* app_lifetime_helper,
+              base::TimeDelta release_delay_,
               scoped_refptr<base::SingleThreadTaskRunner> app_task_runner);
 
   // Don't need to use weak ptr because if the app thread is alive that means
   // app is.
   AppLifetimeHelper* app_lifetime_helper_;
+
+  // Delay before releasing the ref-count.
+  base::TimeDelta release_delay_;
+
   scoped_refptr<base::SingleThreadTaskRunner> app_task_runner_;
 
 #ifndef NDEBUG
   scoped_refptr<base::SingleThreadTaskRunner> clone_task_runner_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(AppRefCount);
 };
 
 // This is a helper class for apps to manage their lifetime, specifically so
 // apps can quit when they're not used anymore.
 // An app can contain an object of this class as a member variable. Each time it
 // creates an instance of a service, it gives it a refcount using
 // CreateAppRefCount. The service implementation then keeps that object as a
 // member variable. When all the service implemenations go away, the app will be
 // quit with a call to mojo::ApplicationImpl::Terminate().
 class AppLifetimeHelper {
  public:
   explicit AppLifetimeHelper(ApplicationImpl* app);
   ~AppLifetimeHelper();
 
   scoped_ptr<AppRefCount> CreateAppRefCount();
+  scoped_ptr<AppRefCount> CreateAppRefCount(base::TimeDelta release_delay);
 
  private:
   friend AppRefCount;
   void AddRef();
   void Release();
 
   friend ApplicationImpl;
   void ApplicationTerminated();
 
   ApplicationImpl* app_;
   int ref_count_;
 
   DISALLOW_COPY_AND_ASSIGN(AppLifetimeHelper);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_APPLICATION_PUBLIC_CPP_APP_LIFETIME_HELPER_H_