Add the option to disable IPv6 ICE candidates on WiFi

webrtc/p2p/base/portallocator.h

Index: webrtc/p2p/base/portallocator.h
diff --git a/webrtc/p2p/base/portallocator.h b/webrtc/p2p/base/portallocator.h
index 016a7dc996b41acca85987323274637b1951a730..eb7308cb363d89af8dbcce5e09d38b6301bf1820 100644
--- a/webrtc/p2p/base/portallocator.h
+++ b/webrtc/p2p/base/portallocator.h
@@ -73,6 +73,9 @@ enum {
   // candidates. Doing so ensures that even if a cellular network type was not
   // detected initially, it would not be used if a Wi-Fi network is present.
   PORTALLOCATOR_DISABLE_COSTLY_NETWORKS = 0x2000,
+
+  // When specified, do not collect IPv6 ICE candidates on Wi-Fi.
+  PORTALLOCATOR_ENABLE_IPV6_ON_WIFI = 0x4000,
 };
 
 // Defines various reasons that have caused ICE regathering.