Instrument direct surfaces of NetworkInformation.

Bug: 973801
Change-Id: I9f379f98df5e6d0ffc232b395a31758206c24901
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2365133Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Commit-Queue: Caleb Raitto <caraitto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800145}

third_party/blink/renderer/modules/netinfo/network_information.idl

@@ -36,5 +36,5 @@ typedef unsigned long long Milliseconds;
     [MeasureAs=NetInfoEffectiveType] readonly attribute EffectiveConnectionType effectiveType;
     [MeasureAs=NetInfoRtt] readonly attribute Milliseconds rtt;
     [MeasureAs=NetInfoDownlink] readonly attribute Megabit downlink;
-    [MeasureAs=NetInfoSaveData] readonly attribute boolean saveData;
+    [HighEntropy=Direct, MeasureAs=NetInfoSaveData] readonly attribute boolean saveData;
 };