Let Contraints Controll Mute/Unmute Audio Local Playback For Desktop Sharing

chrome/browser/media/webrtc/desktop_capture_access_handler.cc

Index: chrome/browser/media/webrtc/desktop_capture_access_handler.cc
diff --git a/chrome/browser/media/webrtc/desktop_capture_access_handler.cc b/chrome/browser/media/webrtc/desktop_capture_access_handler.cc
index 557e24d610a8a481e6e64d3f6433caea4f2a3331..732ca509e82c2dc7149b6f723b8e7a988a44d257 100644
--- a/chrome/browser/media/webrtc/desktop_capture_access_handler.cc
+++ b/chrome/browser/media/webrtc/desktop_capture_access_handler.cc
@@ -152,9 +152,11 @@ std::unique_ptr<content::MediaStreamUI> GetDevicesForDesktopCapture(
       content::MEDIA_DESKTOP_VIDEO_CAPTURE, media_id.ToString(), "Screen"));
   if (capture_audio) {
     if (media_id.type == content::DesktopMediaID::TYPE_WEB_CONTENTS) {
+      content::WebContentsMediaCaptureId web_id = media_id.web_contents_id;
+      web_id.mute_source = mute_system_audio;
       devices->push_back(
           content::MediaStreamDevice(content::MEDIA_DESKTOP_AUDIO_CAPTURE,
-                                     media_id.ToString(), "Tab audio"));
+                                     web_id.ToString(), "Tab audio"));
     } else if (mute_system_audio) {
       // Use the special loopback device ID for system audio capture.
       devices->push_back(content::MediaStreamDevice(
@@ -316,7 +318,8 @@ void DesktopCaptureAccessHandler::ProcessScreenCaptureAccessRequest(
       // display the notification for stream capture.
       bool display_notification = !component_extension;
 
-      ui = GetDevicesForDesktopCapture(&devices, screen_id, capture_audio, true,
+      ui = GetDevicesForDesktopCapture(&devices, screen_id, capture_audio,
+                                       request.mute_source,
                                        display_notification, application_title,
                                        application_title);
       DCHECK(!devices.empty());
@@ -425,7 +428,8 @@ void DesktopCaptureAccessHandler::HandleRequest(
       (check_audio_permission ? audio_permitted : true) && audio_requested &&
       audio_supported;
 
-  ui = GetDevicesForDesktopCapture(&devices, media_id, capture_audio, false,
+  ui = GetDevicesForDesktopCapture(&devices, media_id, capture_audio,
+                                   request.mute_source,
                                    true,
                                    GetApplicationTitle(web_contents, extension),
                                    base::UTF8ToUTF16(original_extension_name));