Add hovering feature to AshDevToolsDOMAgent

components/ui_devtools/devtools_server.cc

 // 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.
 
 #include "components/ui_devtools/devtools_server.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/format_macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "base/values.h"
 #include "components/ui_devtools/switches.h"
 #include "net/base/net_errors.h"
 #include "net/log/net_log.h"
 #include "net/server/http_server_request_info.h"
 #include "net/socket/server_socket.h"
 #include "net/socket/tcp_server_socket.h"
 
 namespace ui {
 namespace devtools {
@@ skipping 16 matching lines @@
           &port))
     port = kDefaultPort;
   return port;
 }
 
 }  // namespace
 
 UiDevToolsServer* UiDevToolsServer::devtools_server_ = nullptr;
 
 UiDevToolsServer::UiDevToolsServer(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
-    : task_runner_(task_runner) {
+    scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner)
+    : io_thread_task_runner_(io_thread_task_runner) {
   DCHECK(!devtools_server_);
+  main_thread_task_runner_ = base::ThreadTaskRunnerHandle::Get();
   devtools_server_ = this;
-  if (task_runner_)
+  if (io_thread_task_runner_)
     return;
-  // If task_runner not passed in, create an I/O thread the server can run on
+  // If io_thread_task_runner not passed in, create an I/O thread
   thread_.reset(new base::Thread("UiDevToolsServerThread"));
   base::Thread::Options options;
   options.message_loop_type = base::MessageLoop::TYPE_IO;
   CHECK(thread_->StartWithOptions(options));
-  task_runner_ = thread_->task_runner();
+  io_thread_task_runner_ = thread_->task_runner();
 }
 
 UiDevToolsServer::~UiDevToolsServer() {
   devtools_server_ = nullptr;
 }
 
 // static
 std::unique_ptr<UiDevToolsServer> UiDevToolsServer::Create(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
+    scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner) {
   std::unique_ptr<UiDevToolsServer> server;
   if (IsUiDevToolsEnabled() && !devtools_server_) {
     // TODO(mhashmi): Change port if more than one inspectable clients
-    server.reset(new UiDevToolsServer(task_runner));
+    server.reset(new UiDevToolsServer(io_thread_task_runner));
     server->Start("127.0.0.1", GetUiDevToolsPort());
   }
   return server;
 }
 
 // static
 std::vector<UiDevToolsServer::NameUrlPair>
 UiDevToolsServer::GetClientNamesAndUrls() {
   std::vector<NameUrlPair> pairs;
   if (!devtools_server_)
     return pairs;
 
   for (ClientsList::size_type i = 0; i != devtools_server_->clients_.size();
        i++) {
     pairs.push_back(std::pair<std::string, std::string>(
         devtools_server_->clients_[i]->name(),
         base::StringPrintf("%slocalhost:%d/%" PRIuS,
                            kChromeDeveloperToolsPrefix, GetUiDevToolsPort(),
                            i)));
   }
   return pairs;
 }
 
 void UiDevToolsServer::AttachClient(std::unique_ptr<UiDevToolsClient> client) {
   clients_.push_back(std::move(client));
 }
 
 void UiDevToolsServer::SendOverWebSocket(int connection_id,
                                          const String& message) {
-  task_runner_->PostTask(
+  io_thread_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&net::HttpServer::SendOverWebSocket,
                  base::Unretained(server_.get()), connection_id, message));
 }
 
 void UiDevToolsServer::Start(const std::string& address_string, uint16_t port) {
-  task_runner_->PostTask(
+  io_thread_task_runner_->PostTask(
       FROM_HERE, base::Bind(&UiDevToolsServer::StartServer,
                             base::Unretained(this), address_string, port));
 }
 
 void UiDevToolsServer::StartServer(const std::string& address_string,
                                    uint16_t port) {
   DCHECK(!server_);
   std::unique_ptr<net::ServerSocket> socket(
       new net::TCPServerSocket(nullptr, net::NetLogSource()));
   constexpr int kBacklog = 1;
@@ skipping 21 matching lines @@
       !base::StringToSizeT(info.path.substr(1), &target_id) ||
       target_id > clients_.size())
     return;
 
   UiDevToolsClient* client = clients_[target_id].get();
   // Only one user can inspect the client at a time
   if (client->connected())
     return;
   client->set_connection_id(connection_id);
   connections_[connection_id] = client;
-  task_runner_->PostTask(
+  io_thread_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&net::HttpServer::AcceptWebSocket,
                  base::Unretained(server_.get()), connection_id, info));
 }
 
 void UiDevToolsServer::OnWebSocketMessage(int connection_id,
                                           const std::string& data) {
   ConnectionsMap::iterator it = connections_.find(connection_id);
   DCHECK(it != connections_.end());
   UiDevToolsClient* client = it->second;
   DCHECK(client);
-  task_runner_->PostTask(FROM_HERE, base::Bind(&UiDevToolsClient::Dispatch,
-                                               base::Unretained(client), data));
+  main_thread_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&UiDevToolsClient::Dispatch, base::Unretained(client), data));
 }
 
 void UiDevToolsServer::OnClose(int connection_id) {
   ConnectionsMap::iterator it = connections_.find(connection_id);
   if (it == connections_.end())
     return;
   UiDevToolsClient* client = it->second;
   DCHECK(client);
-  client->Disconnect();
+  main_thread_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&UiDevToolsClient::Disconnect, base::Unretained(client)));
   connections_.erase(it);
 }
 
 }  // namespace devtools
 }  // namespace ui