Create a new preference which disables UDP protocol for WebRTC

chrome/browser/renderer_preferences_util.cc

 // Copyright (c) 2012 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/renderer_preferences_util.h"
 
 #include "base/macros.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
@@ skipping 27 matching lines @@
                               Profile* profile,
                               content::WebContents* web_contents) {
   const PrefService* pref_service = profile->GetPrefs();
   prefs->accept_languages = pref_service->GetString(prefs::kAcceptLanguages);
   prefs->enable_referrers = pref_service->GetBoolean(prefs::kEnableReferrers);
   prefs->enable_do_not_track =
       pref_service->GetBoolean(prefs::kEnableDoNotTrack);
 #if defined(ENABLE_WEBRTC)
   prefs->enable_webrtc_multiple_routes =
       pref_service->GetBoolean(prefs::kWebRTCMultipleRoutesEnabled);
+  prefs->enable_webrtc_udp_transport =
+      pref_service->GetBoolean(prefs::kWebRTCUdpTransportEnabled);

[pthatcher2, 2015/08/25 23:12:34]

I thought we were going to call this something like kWebRTCForceThroughProxy
(default false), so that later if we do have UDP proxies (like RETURN), we could
still have UDP traffic, as long as it went through the proxy.

[guoweis_left_chromium, 2015/08/26 14:43:40]

Whether traffic goes through proxy or not is a decision that chrome owns and
enforces. ForceThroughProxy doesn't seem a right term to me when there is no
proxy configured. When there is RETURN, I would assume it's a configuration of
chrome and WebRTC should be the same and UDP packets just get routed
differently.

[pthatcher2, 2015/08/26 18:25:39]

kWebRTCNonproxiedUdpTransportEnabled would also work

 #endif
 
   double default_zoom_level = 0;
   bool default_zoom_level_set = false;
 #if !defined(OS_ANDROID)
   ui_zoom::ZoomController* zoom_controller =
       ui_zoom::ZoomController::FromWebContents(web_contents);
   if (zoom_controller) {
     default_zoom_level = zoom_controller->GetDefaultZoomLevel();
     default_zoom_level_set = true;
@@ skipping 61 matching lines @@
 #endif  // OS_LINUX
 #endif
 
 #if !defined(OS_MACOSX)
   prefs->plugin_fullscreen_allowed =
       pref_service->GetBoolean(prefs::kFullscreenAllowed);
 #endif
 }
 
 }  // namespace renderer_preferences_util