Add a new way of using ServiceProviderImpl without InterfaceFactory.

mojo/public/cpp/application/application_connection.h

Index: mojo/public/cpp/application/application_connection.h
diff --git a/mojo/public/cpp/application/application_connection.h b/mojo/public/cpp/application/application_connection.h
index 3507974d0832f657e4a11885458efb7fe7b9fded..8979d0cf4b81e6a74d4b39ee619e53bc6a67e07b 100644
--- a/mojo/public/cpp/application/application_connection.h
+++ b/mojo/public/cpp/application/application_connection.h
@@ -12,6 +12,7 @@
 
 namespace mojo {
 
+struct ConnectionContext;
 class ServiceConnector;
 
 // Represents a connection to another application. An instance of this class is
@@ -34,6 +35,8 @@ class ServiceConnector;
 //   connection->AddService<Bar>(&my_foo_and_bar_factory_);
 //
 // The InterfaceFactory must outlive the ApplicationConnection.
+//
+// TODO(vtl): Don't get too attached to this class. I'm going to remove it.
 class ApplicationConnection {
  public:
   virtual ~ApplicationConnection();
@@ -47,6 +50,8 @@ class ApplicationConnection {
         Interface::Name_);
   }
 
+  virtual const ConnectionContext& GetConnectionContext() const = 0;
+
   // Returns the URL that was used by the source application to establish a
   // connection to the destination application.
   //