First cut at mojo spy's websocket server

mojo/spy/websocket_server.h

Index: mojo/spy/websocket_server.h
diff --git a/mojo/spy/websocket_server.h b/mojo/spy/websocket_server.h
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+// Copyright 2014 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 MOJO_SPY_WEBSOCKET_SERVER_H_
+#define MOJO_SPY_WEBSOCKET_SERVER_H_
+
+#include "net/server/http_server.h"
+
+namespace spy {
+
+class WebSocketServer : public net::HttpServer::Delegate {
+ public:
+  // Pass 0 in |port| to listen in one available port.
+  explicit WebSocketServer(int port);
+  virtual ~WebSocketServer();
+  // Begin accepting HTTP requests. Must be called from an IO MessageLoop.
+  bool Start();
+  // Returns the listening port, useful if 0 was passed to the contructor.
+  int port() const { return port_; }
+
+ protected:
+  // Overridden from net::HttpServer::Delegate.
+  virtual void OnHttpRequest(
+      int connection_id,
+      const net::HttpServerRequestInfo& info) OVERRIDE;
+  virtual void OnWebSocketRequest(
+      int connection_id,
+      const net::HttpServerRequestInfo& info) OVERRIDE;
+  virtual void OnWebSocketMessage(
+      int connection_id,
+      const std::string& data) OVERRIDE;
+  virtual void OnClose(int connection_id) OVERRIDE;
+
+ private:
+  int port_;
+  int connection_id_;
+  scoped_refptr<net::HttpServer> server_;
+  DISALLOW_COPY_AND_ASSIGN(WebSocketServer);
+};
+
+}  // namespace spy
+
+#endif  // MOJO_SPY_WEBSOCKET_SERVER_H_