Expose ECT to render frames, Blink and NetInfo

third_party/WebKit/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.
 
 // https://wicg.github.io/netinfo/#the-networkinformation-interface
 
 enum ConnectionType {
     "cellular",
     "bluetooth",
     "ethernet",
     "wifi",
     "wimax",
     "other",
     "none",
     "unknown"
 };
 
+enum EffectiveConnectionType {
+    "slow-2g",
+    "2g",
+    "3g",
+    "4g"
+};
+
 typedef unrestricted double Megabit;
 typedef unsigned long long Milliseconds;
 
 [
     ActiveScriptWrappable,
     DependentLifetime,
     Exposed=(Window,Worker),
     RuntimeEnabled=NetworkInformation,
 ] interface NetworkInformation : EventTarget {
     [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;
+    [MeasureAs=NetInfoEffectiveType] readonly attribute EffectiveConnectionType effectiveType;

[foolip, 2017/05/29 11:39:40]

Looks like RuntimeEnabled=NetInfoEffectiveType was omitted accidentally here,
shipping effectiveType for M60. This may have been a problem since
https://codereview.chromium.org/2642873002/, not sure.

Filed https://crbug.com/727285 to sort it out.

     [RuntimeEnabled=NetInfoRtt, MeasureAs=NetInfoRtt] readonly attribute Milliseconds rtt;  
     [RuntimeEnabled=NetInfoDownlink, MeasureAs=NetInfoDownlink] readonly attribute Megabit downlink;
 };