Reify view ownership as a message pipe.

examples/ui/tile/tile_app.h

Index: examples/ui/tile/tile_app.h
diff --git a/examples/ui/tile/tile_app.h b/examples/ui/tile/tile_app.h
index 1b4d61996c11b62e58d2b11b9b47cb48522a44bf..35ba7673a6bc8d3a148a36702cf84e20de558b4c 100644
--- a/examples/ui/tile/tile_app.h
+++ b/examples/ui/tile/tile_app.h
@@ -14,11 +14,11 @@ class TileApp : public mojo::ui::ViewProviderApp {
   TileApp();
   ~TileApp() 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(TileApp);