Plumbing from WebPresentationClient to the Presentation Mojo service for

content/common/presentation_service.mojom

+// 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.
+
+module presentation;
+
+[Client=PresentationServiceClient]

[mlamouri (slow - plz ping), 2015/01/08 15:08:54]

My understanding is that we want to get ride of Client...

[whywhat, 2015/01/08 17:28:53]

Done.

+interface PresentationService {
+  /* NavigatorPresentation idl */
+
+  // Called when a listener is added to navigator.presentation.availablechange.
+  // Might start device discovery.
+  AddDeviceAvailabilityListener();

[mlamouri (slow - plz ping), 2015/01/08 15:08:54]

... instead, you could pass an interface in this method.

[whywhat, 2015/01/08 17:28:53]

Done.

+
+  // Called when a listener is removed from
+  // navigator.presentation.availablechange.
+  // Might stop device discovery.
+  RemoveDeviceAvailabilityListener();

[mlamouri (slow - plz ping), 2015/01/08 15:08:54]

... and that one.

[whywhat, 2015/01/08 17:28:53]

Got it. Very convenient :(

+};
+
+interface PresentationServiceClient {
+  // Called when the device availability changes.
+  // Fires the |availablechange| event.

[Peter Beverloo, 2015/01/07 19:41:21]

+"in JavaScript."

[whywhat, 2015/01/08 17:28:53]

Done.

+  DeviceAvailabilityChanged(bool available);
+};