Add ui devtools server

components/ui_devtools/devtools_client.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_DEVTOOLS_CLIENT_H_
+#define UI_DEVTOOLS_DEVTOOLS_CLIENT_H_
+
+#include <string>
+
+#include "components/ui_devtools/DOM.h"
+#include "components/ui_devtools/Forward.h"
+#include "components/ui_devtools/Protocol.h"
+
+namespace ui {
+namespace devtools {
+
+class UiDevToolsServer;
+
+// Every UI component that wants to be inspectable must instantiate
+// this class and attach the corresponding backends/frontends (i.e: DOM, CSS,
+// etc). This client is then attached to the UiDevToolsServer and all messages
+// from this client are sent over the web socket owned by the server.
+class UiDevToolsClient : public protocol::FrontendChannel {

[dgozman, 2016/10/20 20:45:58]

Maybe I misunderstand something, but this doesn't look like a "client", but
rather a real backend/connection/channel implementation.

[Sarmad Hashmi, 2016/10/20 21:49:22]

You are correct in thinking that. This is a UI client in the sense that it is a
client of the UI server. It has all the backend implementation but in the end,
it still receives messages from the server and responds through it. The
inspector can therefore inspect attached "clients" through the server.

+ public:
+  static const int kNotConnected = -1;
+
+  UiDevToolsClient(const std::string& name, UiDevToolsServer* server);
+  ~UiDevToolsClient() override;
+
+  void AddDOMBackend(std::unique_ptr<protocol::DOM::Backend> dom_backend);
+  void Dispatch(const String& data);

[sadrul, 2016/10/20 16:56:29]

const std::string&

[Sarmad Hashmi, 2016/10/20 21:49:22]

Done.

+
+  bool connected() const;
+  void set_connection_id(int connection_id);
+  const std::string& name() const;
+
+ private:
+  // protocol::FrontendChannel
+  void sendProtocolResponse(int callId, const String& message) override;
+  void sendProtocolNotification(const String& message) override;
+  void flushProtocolNotifications() override;
+
+  std::string name_;
+  int connection_id_;
+
+  std::unique_ptr<protocol::DOM::Backend> dom_backend_;
+  protocol::UberDispatcher dispatcher_;
+  UiDevToolsServer* server_;
+
+  DISALLOW_COPY_AND_ASSIGN(UiDevToolsClient);
+};
+
+}  // namespace devtools
+}  // namespace ui
+
+#endif  // UI_DEVTOOLS_DEVTOOLS_CLIENT_H_