[NetInfo] Browser changes to support connection.downlinkMax

content/test/data/net_info.html

Index: content/test/data/net_info.html
diff --git a/content/test/data/net_info.html b/content/test/data/net_info.html
index 8e4368dc4cbfedaaeafb18737688500f6300ea82..aa3e5e1929f440b2636f699d4bb68d05592bd576 100644
--- a/content/test/data/net_info.html
+++ b/content/test/data/net_info.html
@@ -6,6 +6,10 @@ function getType() {
   sendValueToTest(navigator.connection.type);
 }
 
+function getDownlinkMax() {
+  sendValueToTest(navigator.connection.downlinkMax.toString());
+}
+
 function getOnLine() {
   sendValueToTest(navigator.onLine);
 }