Expose ECT to render frames, Blink and NetInfo

third_party/WebKit/Source/modules/netinfo/NetworkInformation.idl

Index: third_party/WebKit/Source/modules/netinfo/NetworkInformation.idl
diff --git a/third_party/WebKit/Source/modules/netinfo/NetworkInformation.idl b/third_party/WebKit/Source/modules/netinfo/NetworkInformation.idl
index a09b917fc0295fb7f76f2e29240a80107864b6fd..c47e8b9e9bb9af804c273f605bde9bd69defd146 100644
--- a/third_party/WebKit/Source/modules/netinfo/NetworkInformation.idl
+++ b/third_party/WebKit/Source/modules/netinfo/NetworkInformation.idl
@@ -15,6 +15,13 @@ enum ConnectionType {
     "unknown"
 };
 
+enum EffectiveConnectionType {
+    "slow-2g",
+    "2g",
+    "3g",
+    "4g"
+};
+
 typedef unrestricted double Megabit;
 typedef unsigned long long Milliseconds;
 
@@ -28,6 +35,7 @@ typedef unsigned long long Milliseconds;
     [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;
 };