mozart: Introduce new view manager interfaces.

mojo/services/ui/views/interfaces/view_provider.mojom

Index: mojo/services/ui/views/interfaces/view_provider.mojom
diff --git a/mojo/services/ui/views/interfaces/view_provider.mojom b/mojo/services/ui/views/interfaces/view_provider.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..b1dee7af74fd0b4ee7a55b5cee1fd5e7cd1dc589
--- /dev/null
+++ b/mojo/services/ui/views/interfaces/view_provider.mojom
@@ -0,0 +1,26 @@
+// 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.
+
+[DartPackage="mojo_services"]
+module mojo.ui;
+
+import "mojo/public/interfaces/application/service_provider.mojom";
+import "mojo/services/ui/views/interfaces/views.mojom";
+
+// Provides a View upon request.
+//
+// Applications should implement and expose this service so that they can
+// expose views to be embedded into other applications.
+interface ViewProvider {
+  // Creates and registers a view with the view manager and returns its token.
+  //
+  // The caller may provide services to the view via the |services|
+  // service provider.
+  //
+  // The caller may receive services from the view via the |exposed_services|
+  // service provider.
+  CreateView(mojo.ServiceProvider&? services,
+             mojo.ServiceProvider? exposed_services) =>
+                 (ViewToken view_token);

[jamesr, 2015/10/26 19:35:38]

what are the requirements for |view_token|? is the implementation of CreateView
responsible for minting tokens, or should it query those from somewhere else? if
it has to mint tokens does it need to make sure the tokens are locally unique or
globally unique?

[jeffbrown, 2015/10/27 01:49:07]

It's minted by the view manager when the view is registered.

+};