Mandoline: Introduce ApplicationConnection::CloseConnection

mojo/application/public/cpp/application_impl.h

Index: mojo/application/public/cpp/application_impl.h
diff --git a/mojo/application/public/cpp/application_impl.h b/mojo/application/public/cpp/application_impl.h
index 7036d33dbc6b72beff66800258d101ca20a093db..ea50152ef3278684fa236ee5bdd1739008e73803 100644
--- a/mojo/application/public/cpp/application_impl.h
+++ b/mojo/application/public/cpp/application_impl.h
@@ -79,10 +79,18 @@ class ApplicationImpl : public Application,
   // 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.
+  // valid until an error occurs on the connection with the Shell, until the
+  // ApplicationImpl is destroyed, or until the connection is closed through a
+  // call to ApplicationConnection::CloseConnection.
   ApplicationConnection* ConnectToApplication(mojo::URLRequestPtr request);
 
+  // Closes the |connection|.
+  void CloseConnection(ApplicationConnection* connection);
+
+  // Called by the ApplicationRunner to indicate that the ApplicationImpl will
+  // be destroyed soon.
+  void WillDestroySoon();
+
   // Connect to application identified by |request->url| and connect to the
   // service implementation of the interface identified by |Interface|.
   template <typename Interface>