[NetInfo] Add Blink support for connection.change, connection.downlinkMax, and wimax

LayoutTests/netinfo/resources/netinfo_common.js

Index: LayoutTests/netinfo/resources/netinfo_common.js
diff --git a/LayoutTests/netinfo/resources/netinfo_common.js b/LayoutTests/netinfo/resources/netinfo_common.js
index 07b0617832cddb9a049244fe0156429d3fda7e18..57e3c45dbb900469f8e26a8143963197d5680536 100644
--- a/LayoutTests/netinfo/resources/netinfo_common.js
+++ b/LayoutTests/netinfo/resources/netinfo_common.js
@@ -1,10 +1,14 @@
 window.jsTestIsAsync = true;
 
+var connection = navigator.connection;
+var initialType = "bluetooth";
+var initialDownlinkMax = 1.0;
+var newConnectionType = "ethernet";
+var newDownlinkMax = 2.0;
+
 // Suppress connection messages information from the host.
 if (window.internals) {
     internals.setNetworkStateNotifierTestOnly(true);
+    internals.setNetworkConnectionInfo(initialType, initialDownlinkMax);
 }
 
-var connection = navigator.connection;
-var initialType = connection.type;
-var newConnectionType = connection.type == "bluetooth" ? "ethernet" : "bluetooth";