media: Quit MojoMediaApplication when no service is bound.

mojo/application/public/cpp/application_impl.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_APPLICATION_PUBLIC_CPP_APPLICATION_IMPL_H_
 #define MOJO_APPLICATION_PUBLIC_CPP_APPLICATION_IMPL_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 62 matching lines @@
   Shell* shell() const { return shell_.get(); }
 
   const std::string& url() const { return url_; }
 
   AppLifetimeHelper* app_lifetime_helper() { return &app_lifetime_helper_; }
 
   // Requests a new connection to an application. Returns a pointer to the
   // connection if the connection is permitted by this application's delegate,
   // or nullptr otherwise. Caller does not take ownership. The pointer remains
   // valid until an error occurs on the connection with the Shell, or until the
-  // ApplicationImpl is destroyed, whichever occurs first.
+  // ApplicationImpl is destroyed, whichever occurs first. If |error_cb| is
+  // provided, it will be fired when the application is terminated.
   ApplicationConnection* ConnectToApplication(mojo::URLRequestPtr request);
+  ApplicationConnection* ConnectToApplication(mojo::URLRequestPtr request,
+                                              const base::Closure& error_cb);

[sandersd (OOO until July 31), 2015/06/30 21:32:47]

It's true that this is caused by a connection error, but it doesn't seem to be
an error state. |terminate_cb| instead?

[xhwang, 2015/07/07 20:29:24]

Done.

 
   // Connect to application identified by |request->url| and connect to the
   // service implementation of the interface identified by |Interface|.
   template <typename Interface>
   void ConnectToService(mojo::URLRequestPtr request,
                         InterfacePtr<Interface>* ptr) {
     ConnectToApplication(request.Pass())->ConnectToService(ptr);
   }
 
   // Application implementation.
@@ skipping 40 matching lines @@
   AppLifetimeHelper app_lifetime_helper_;
   bool quit_requested_;
   base::WeakPtrFactory<ApplicationImpl> weak_factory_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(ApplicationImpl);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_APPLICATION_PUBLIC_CPP_APPLICATION_IMPL_H_