Add ui devtools server

ui/devtools/devtools_server.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 UI_DEVTOOLS_SERVER_H_
+#define UI_DEVTOOLS_SERVER_H_
+
+#include <vector>
+
+#include "base/threading/thread.h"
+#include "net/server/http_server.h"
+#include "ui/devtools/DOM.h"
+#include "ui/devtools/Forward.h"
+#include "ui/devtools/Protocol.h"
+#include "ui/devtools/StringUtil.h"
+#include "ui/devtools/devtools_client.h"
+
+namespace ui {
+namespace devtools {
+
+class UiDevToolsServer : public net::HttpServer::Delegate {
+ public:
+  UiDevToolsServer();
+  ~UiDevToolsServer() override;
+
+  void Start(const std::string& address_string, uint16_t port);
+  void AttachClient(std::unique_ptr<UiDevToolsClient> client);
+
+ private:
+  friend class UiDevToolsClient;

[sadrul, 2016/10/17 16:05:08]

Why does UiDevToolsClient need to be friend? Can you just make
'SendOverWebSocket()' a public method instead?

[Sarmad Hashmi, 2016/10/17 16:58:21]

Done. Wasn't sure whether it was necessary to make SendOverWebSocket since
nothing else would not (and should not) be using SendOverWebSocket but the
UiDevToolsClient.

+  void StartServer(const std::string& address_string, uint16_t port);
+  void SendOverWebSocket(int connection_id, const String& message);
+
+  // HttpServer::Delegate
+  void OnConnect(int connection_id) override;
+  void OnHttpRequest(int connection_id,
+                     const net::HttpServerRequestInfo& info) override;
+  void OnWebSocketRequest(int connection_id,
+                          const net::HttpServerRequestInfo& info) override;
+  void OnWebSocketMessage(int connection_id, const std::string& data) override;
+  void OnClose(int connection_id) override;
+
+  using ClientsList = std::vector<std::unique_ptr<UiDevToolsClient>>;
+  using ConnectionsMap = std::map<uint32_t, UiDevToolsClient*>;
+  ClientsList clients_;
+  ConnectionsMap connections_;
+  std::unique_ptr<base::Thread> thread_;

[sadrul, 2016/10/17 16:05:08]

If the user already has an IO thread, then it's probably not necessary to create
one here. Leave a TODO to allow injecting a task-runner for the IO thread
instead of always creating+owning the IO thread from here.

[Sarmad Hashmi, 2016/10/17 16:58:21]

Done.

+  std::unique_ptr<net::HttpServer> server_;
+
+  DISALLOW_COPY_AND_ASSIGN(UiDevToolsServer);
+};
+
+}  // namespace devtools
+}  // namespace ui
+
+#endif  // UI_DEVTOOLS_SERVER_H_