Plumbing from WebPresentationClient to the Presentation Mojo service for

content/browser/presentation/presentation_service_impl.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 CONTENT_BROWSER_PRESENTATION_PRESENTATION_SERVICE_IMPL_H_
+#define CONTENT_BROWSER_PRESENTATION_PRESENTATION_SERVICE_IMPL_H_
+
+#include "base/macros.h"
+#include "content/common/presentation/presentation_service.mojom.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+
+namespace content {
+
+// Implements the PresentationService Mojo interface.
+// This service can be created from a RenderFrameHost.
+class PresentationServiceImpl :
+    public mojo::InterfaceImpl<presentation::PresentationService> {
+ public:
+  ~PresentationServiceImpl() override;
+
+  static void CreateService(
+      mojo::InterfaceRequest<presentation::PresentationService> request);
+
+ protected:
+  PresentationServiceImpl();
+
+ private:
+  typedef mojo::Callback<void(bool)> AvailabilityCallback;
+
+  // PresentationService implementation.
+  void GetScreenAvailability(const AvailabilityCallback& callback) override;

[mark a. foltz, 2015/01/27 21:56:09]

Should this implementation method be private?  Where is it going to be called?

[whywhat, 2015/01/28 01:52:37]

It's an override of the base class method which is public and will be called by
Mojo framework when the client calls the corresponding method through
PresentationServicePtr

+
+  DISALLOW_COPY_AND_ASSIGN(PresentationServiceImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_PRESENTATION_PRESENTATION_SERVICE_IMPL_H_