Bug 1589461 - Add network id change event (Android), r=kershaw

Differential Revision: https://phabricator.services.mozilla.com/D50429

--HG--
extra : moz-landing-system : lando

netwerk/system/android/nsAndroidNetworkLinkService.cpp

@@ -153,7 +153,12 @@ void nsAndroidNetworkLinkService::OnNetworkChanged() {
   }
 }
 
-void nsAndroidNetworkLinkService::OnNetworkIDChanged() {}
+void nsAndroidNetworkLinkService::OnNetworkIDChanged() {
+  RefPtr<nsAndroidNetworkLinkService> self = this;
+  NS_DispatchToMainThread(NS_NewRunnableFunction(
+      "nsAndroidNetworkLinkService::OnNetworkIDChanged",
+      [self]() { self->SendEvent(NS_NETWORK_LINK_DATA_NETWORKID_CHANGED); }));
+}
 
 void nsAndroidNetworkLinkService::OnLinkUp() {
   RefPtr<nsAndroidNetworkLinkService> self = this;