Plumbing from WebPresentationClient to the Presentation Mojo service for

content/common/presentation/presentation_service.mojom

Index: content/common/presentation/presentation_service.mojom
diff --git a/content/common/presentation/presentation_service.mojom b/content/common/presentation/presentation_service.mojom
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+// 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;
+
+import "content/common/presentation/presentation_service_client.mojom";
+
+interface PresentationService {
+  // Binds the PresentationService with the renderer side of the Presentation
+  // API.
+  SetClient(PresentationServiceClient client);
+
+  // Called when the first listener is added to or the last listener is removed
+  // from the |availablechange| event.
+  // Might start or stop the presentation screens discovery.
+  UpdateAvailableChangeWatched(bool watched);
+};