Add hovering feature to AshDevToolsDOMAgent

components/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 COMPONENTS_UI_DEVTOOLS_DEVTOOLS_SERVER_H_
 #define COMPONENTS_UI_DEVTOOLS_DEVTOOLS_SERVER_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 10 matching lines @@
 namespace devtools {
 
 class UI_DEVTOOLS_EXPORT UiDevToolsServer
     : public NON_EXPORTED_BASE(net::HttpServer::Delegate) {
  public:
   ~UiDevToolsServer() override;
 
   // Returns an empty unique_ptr if ui devtools flag isn't enabled or if a
   // server instance has already been created.
   static std::unique_ptr<UiDevToolsServer> Create(
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+      scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner);
 
   // Returns a list of attached UiDevToolsClient name + URL
   using NameUrlPair = std::pair<std::string, std::string>;
   static std::vector<NameUrlPair> GetClientNamesAndUrls();
 
   void AttachClient(std::unique_ptr<UiDevToolsClient> client);
   void SendOverWebSocket(int connection_id, const String& message);
 
  private:
   explicit UiDevToolsServer(
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+      scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner);
 
   void Start(const std::string& address_string, uint16_t port);
   void StartServer(const std::string& address_string, uint16_t port);
 
   // 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_;
   std::unique_ptr<net::HttpServer> server_;
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
 
   // The server (owned by ash for now)
   static UiDevToolsServer* devtools_server_;
 
   DISALLOW_COPY_AND_ASSIGN(UiDevToolsServer);
 };
 
 }  // namespace devtools
 }  // namespace ui
 
 #endif  // COMPONENTS_UI_DEVTOOLS_DEVTOOLS_SERVER_H_