[Presentation API] (alternative) 1-UA: send message between controller and receiver page

content/renderer/presentation/renderer_presentation_connection.h

+// Copyright 2016 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_RENDERER_PRESENTATION_CONNECTION_H_
+#define CONTENT_RENDERER_PRESENTATION_RENDERER_PRESENTATION_CONNECTION_H_
+
+#include "base/callback.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "third_party/WebKit/public/platform/modules/presentation/WebPresentationConnection.h"
+#include "third_party/WebKit/public/platform/modules/presentation/WebPresentationConnectionProxy.h"
+#include "third_party/WebKit/public/platform/modules/presentation/presentation.mojom.h"
+
+namespace content {
+

[mark a. foltz, 2016/10/10 18:28:52]

Can you add a class-level comment describing what this is for?

[zhaobin, 2016/10/12 02:27:34]

Done.

+class RendererPresentationConnection

[mark a. foltz, 2016/10/10 18:28:52]

There is already a PresentationConnection object in Blink and Mojo used in the
renderer, so it's a little ambiguous to have a third object named
PresentationConnection here.

Maybe PresentationConnectionProxy to match how it is used?

[zhaobin, 2016/10/12 02:27:34]

Done.

+    : public blink::WebPresentationConnectionProxy,
+      public NON_EXPORTED_BASE(blink::mojom::PresentationConnection) {
+ public:
+  RendererPresentationConnection();
+  ~RendererPresentationConnection() override;
+
+  blink::mojom::PresentationConnectionPtr Bind();
+
+  // WebPresentationConnectionProxy Implementation
+  void SetConnection(blink::WebPresentationConnection* connection) override;

[mark a. foltz, 2016/10/10 18:28:52]

Maybe SetSourceConnection?

[zhaobin, 2016/10/12 02:27:34]

Done.

+  void SendString(const blink::WebString& message) override;
+  void SendArrayBuffer(const uint8_t* data, size_t length) override;
+
+  // blink::mojom::PresentationConnection implementation
+  void SetTargetConnection(
+      blink::mojom::PresentationConnectionPtr connection) override;
+  void OnSessionMessageReceived(

[mark a. foltz, 2016/10/10 18:28:52]

OnConnectionMessageReceived

[zhaobin, 2016/10/12 02:27:34]

Done.

+      blink::mojom::SessionMessagePtr message) override;
+
+ private:
+  mojo::Binding<blink::mojom::PresentationConnection> binding_;
+  blink::mojom::PresentationConnectionPtr target_connection_;
+  blink::WebPresentationConnection* connection_;

[mark a. foltz, 2016/10/10 18:28:52]

source_connection_

[zhaobin, 2016/10/12 02:27:34]

Done.

+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_PRESENTATION_RENDERER_PRESENTATION_CONNECTION_H_