Plumbing from WebPresentationClient to the Presentation Mojo service for

content/renderer/presentation/presentation_dispatcher.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_RENDERER_PRESENTATION_PRESENTATION_DISPATCHER_H_
+#define CONTENT_RENDERER_PRESENTATION_PRESENTATION_DISPATCHER_H_
+
+#include "content/common/presentation_service.mojom.h"
+#include "content/public/renderer/render_frame_observer.h"
+#include "third_party/WebKit/public/platform/WebPresentationClient.h"
+
+namespace content {
+
+// PresentationDispatcher is a delegate for Presentation API messages used by
+// Blink. It forwards the calls to the Mojo PresentationService.
+class PresentationDispatcher
+    : public RenderFrameObserver,
+      public blink::WebPresentationClient,
+      public mojo::InterfaceImpl<presentation::PresentationServiceClient> {
+ public:
+  explicit PresentationDispatcher(RenderFrame* render_frame);
+  ~PresentationDispatcher() override;
+
+ private:
+  // WebPresentationClient implementation.
+  virtual void setController(
+      blink::WebPresentationController* controller);
+  virtual void addDeviceAvailabilityListener();
+  virtual void removeDeviceAvailabilityListener();
+
+  // PresentationServiceClient implementation.
+  void DeviceAvailabilityChanged(bool available) override;
+
+  void ConnectToPresentationServiceIfNeeded();
+
+  blink::WebPresentationController* controller_;

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

nit: maybe add a comment about controller_ being a weak reference?

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

A comment pointing that it is a weak reference would simply state the obvious.
You might want to point whether it can be null though and its lifetime.

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

Done.

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

Done.

+  presentation::PresentationServicePtr presentation_service_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_PRESENTATION_PRESENTATION_DISPATCHER_H_