Add user action metric for UI DevTools http server connections

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/message_loop/message_loop.h"
+#include "base/metrics/user_metrics.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"
@@ skipping 103 matching lines @@
       new net::TCPServerSocket(nullptr, net::NetLogSource()));
   constexpr int kBacklog = 1;
   if (socket->ListenWithAddressAndPort(address_string, port, kBacklog) !=
       net::OK)
     return;
   server_ = base::MakeUnique<net::HttpServer>(std::move(socket), this);
 }
 
 // HttpServer::Delegate Implementation
 void UiDevToolsServer::OnConnect(int connection_id) {
-  NOTIMPLEMENTED();
+  base::RecordAction(base::UserMetricsAction("UI_DevTools_Connect"));
 }
 
 void UiDevToolsServer::OnHttpRequest(int connection_id,
                                      const net::HttpServerRequestInfo& info) {
   NOTIMPLEMENTED();
 }
 
 void UiDevToolsServer::OnWebSocketRequest(
     int connection_id,
     const net::HttpServerRequestInfo& info) {
@@ skipping 32 matching lines @@
     return;
   UiDevToolsClient* client = it->second;
   DCHECK(client);
   main_thread_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&UiDevToolsClient::Disconnect, base::Unretained(client)));
   connections_.erase(it);
 }
 
 }  // namespace ui_devtools