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

LayoutTests/netinfo/basic-operation.html

Index: LayoutTests/netinfo/basic-operation.html
diff --git a/LayoutTests/netinfo/basic-operation.html b/LayoutTests/netinfo/basic-operation.html
index 3809b807f3c4222d4b04dab983163c20a033466a..95585aeab9b7b802e6ffd83df5f9a4dcf56d53ee 100644
--- a/LayoutTests/netinfo/basic-operation.html
+++ b/LayoutTests/netinfo/basic-operation.html
@@ -12,14 +12,23 @@ shouldBe('typeof window.internals.observeGC', '"function"',
 
 shouldBeDefined("navigator.connection");
 shouldBeDefined("navigator.connection.type");
+shouldBeDefined("navigator.connection.downlinkMax");
 
 connection.addEventListener('typechange', function(e) {
     shouldBe("typeof connection.type", '"string"');
     shouldBe('connection.type', 'newConnectionType');
+    shouldBe('connection.downlinkMax', 'newDownlinkMax');
     finishJSTest();
 });
 
-internals.setNetworkConnectionInfo(newConnectionType);
+connection.addEventListener('change', function(e) {
+    shouldBe("typeof connection.type", '"string"');
+    shouldBe('connection.type', 'newConnectionType');
+    shouldBe('connection.downlinkMax', 'newDownlinkMax');
+    finishJSTest();
+});
+
+internals.setNetworkConnectionInfo(newConnectionType, newDownlinkMax);
 
 </script>
 </body>