Reify view ownership as a message pipe.

examples/ui/shapes/shapes_app.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 EXAMPLES_UI_SHAPES_SHAPES_APP_H_
 #define EXAMPLES_UI_SHAPES_SHAPES_APP_H_
 
 #include "mojo/ui/view_provider_app.h"
 
 namespace examples {
 
 class ShapesApp : public mojo::ui::ViewProviderApp {
  public:
   ShapesApp();
   ~ShapesApp() override;
 
-  bool CreateView(
+  void CreateView(
       const std::string& connection_url,
+      mojo::InterfaceRequest<mojo::ui::ViewOwner> view_owner_request,
       mojo::InterfaceRequest<mojo::ServiceProvider> services,
-      mojo::ServiceProviderPtr exposed_services,
-      const mojo::ui::ViewProvider::CreateViewCallback& callback) override;
+      mojo::ServiceProviderPtr exposed_services) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShapesApp);
 };
 
 }  // namespace examples
 
 #endif  // EXAMPLES_UI_SHAPES_SHAPES_APP_H_