desktopCapture: set the correct videoTrack label according to the capture type

chrome/browser/media/webrtc/desktop_capture_access_handler.cc

 // Copyright 2015 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 "chrome/browser/media/webrtc/desktop_capture_access_handler.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 146 matching lines @@
   std::unique_ptr<content::MediaStreamUI> ui;
 
   DVLOG(2) << __func__ << ": media_id " << media_id.ToString()
            << ", capture_audio " << capture_audio << ", disable_local_echo "
            << disable_local_echo << ", display_notification "
            << display_notification << ", application_title "
            << application_title << ", extension_name "
            << registered_extension_name;
 
   // Add selected desktop source to the list.
-  devices->push_back(content::MediaStreamDevice(
-      content::MEDIA_DESKTOP_VIDEO_CAPTURE, media_id.ToString(), "Screen"));
+  devices->push_back(
+      content::MediaStreamDevice(content::MEDIA_DESKTOP_VIDEO_CAPTURE,
+                                 media_id.ToString(), media_id.ToString()));
   if (capture_audio) {
     if (media_id.type == content::DesktopMediaID::TYPE_WEB_CONTENTS) {
       content::WebContentsMediaCaptureId web_id = media_id.web_contents_id;
       web_id.disable_local_echo = disable_local_echo;
       devices->push_back(
           content::MediaStreamDevice(content::MEDIA_DESKTOP_AUDIO_CAPTURE,
                                      web_id.ToString(), "Tab audio"));
     } else if (disable_local_echo) {
       // Use the special loopback device ID for system audio capture.
       devices->push_back(content::MediaStreamDevice(
@@ skipping 270 matching lines @@
   const bool display_notification = ShouldDisplayNotification(extension);
 
   ui = GetDevicesForDesktopCapture(&devices, media_id, capture_audio,
                                    request.disable_local_echo,
                                    display_notification,
                                    GetApplicationTitle(web_contents, extension),
                                    base::UTF8ToUTF16(original_extension_name));
   UpdateExtensionTrusted(request, extension);
   callback.Run(devices, content::MEDIA_DEVICE_OK, std::move(ui));
 }