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

Source/modules/netinfo/NetworkInformation.idl

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 enum ConnectionType {
     "cellular",
     "bluetooth",
     "ethernet",
     "wifi",
+    "wimax",
     "other",
     "none",
     "unknown"
 };
 
+typedef unrestricted double Megabit;
+
 [
     RuntimeEnabled=NetworkInformation,
     Exposed=(Window,Worker),
     GarbageCollected,
     ActiveDOMObject
 ] interface NetworkInformation : EventTarget {
-    readonly attribute ConnectionType type;
-    attribute EventHandler ontypechange;
+    [MeasureAs=NetInfoType] readonly attribute ConnectionType type;
+    [RuntimeEnabled=NetInfoDownlinkMax, MeasureAs=NetInfoDownlinkMax] readonly attribute Megabit downlinkMax;
+    [RuntimeEnabled=NetInfoDownlinkMax, MeasureAs=NetInfoOnChange] attribute EventHandler onchange;
+    [MeasureAs=NetInfoOnTypeChange] attribute EventHandler ontypechange;
 };