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

LayoutTests/fast/dom/Window/resources/window-property-collector.js

 function collectProperties(windowHasBeenGCed)
 {
     // Collect properties of the top-level window, since touching the properties
     // of a DOMWindow affects its internal C++ state.
     collectPropertiesHelper(window, windowHasBeenGCed, []);
 
     propertiesToVerify.sort(function (a, b)
     {
         if (a.property < b.property)
             return -1
@@ skipping 29 matching lines @@
     // Skip things that are assumed to be constants.
     if (path[path.length - 1].toUpperCase() == path[path.length - 1])
         return;
 
     // Various special cases for legacy reasons. Please do not add entries to this list.
     var propertyPath = path.join('.');
 
     // Connection type depends on the host, skip.
     if (propertyPath == 'navigator.connection.type')
       return;
+    if (propertyPath == 'navigator.connection.downlinkMax')
+      return;
 
     switch (propertyPath) {
     case "location.href":
         expected = "'about:blank'";
         break;
     case "location.origin":
         expected = "'null'";
         break;
     case "location.pathname":
         expected = "'blank'";
@@ skipping 50 matching lines @@
             emitExpectedResult(path, "0");
         } else if (type == "boolean") {
             expected = "false";
             if (path == "closed" && windowHasBeenGCed )
                 expected = "true";
             emitExpectedResult(path, expected);
         }
         path.pop();
     }
 }