[chrome.displaySource] Add WiFi Display session class skeleton and mojo service

extensions/renderer/api/display_source/wifi_display/wifi_display_session.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 EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_SESSION_H_
+#define EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_SESSION_H_
+
+#include <string>
+
+#include "extensions/common/mojo/wifi_display_session_service.mojom.h"
+#include "extensions/renderer/api/display_source/display_source_session.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace extensions {
+
+class WiFiDisplaySession: public DisplaySourceSession,
+                          public WiFiDisplaySessionServiceClient {
+ public:
+  explicit WiFiDisplaySession(
+      const DisplaySourceSessionParams& params);
+  ~WiFiDisplaySession() override;
+
+ private:
+  // DisplaySourceSession overrides.
+  void Start() override;
+  void Terminate() override;
+
+  // WiFiDisplaySessionServiceClient overrides.
+  void OnConnected(int32_t sink_id,
+                   const mojo::String& ip_address) override;
+  void OnDisconnected(int32_t sink_id) override;
+  void OnError(int32_t sink_id,
+               int32_t type,
+               const mojo::String& description) override;
+  void OnMessage(const mojo::String& data) override;
+
+  // A connection error handler for the mojo objects used in this class.
+  void OnConnectionError();
+
+ private:
+  WiFiDisplaySessionServicePtr service_;
+  mojo::Binding<WiFiDisplaySessionServiceClient> binding_;
+  std::string ip_address_;
+  DisplaySourceSessionParams params_;
+  base::WeakPtrFactory<WiFiDisplaySession> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(WiFiDisplaySession);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_SESSION_H_