Add some 3rd party usage UseCounters to opt_in_features list

Add kThirdPartyServiceWorker, kThirdPartySharedWorker and
kThirdPartyBroadcastChannel to opt_in_features list

Bug: 976866
Change-Id: Ic3c4424dc2703234440c4e490d3b84dfed7a04ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808017Reviewed-by: Bryan McQuade <bmcquade@chromium.org>
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699045}

chrome/browser/page_load_metrics/observers/use_counter/ukm_features.cc

@@ -133,6 +133,9 @@ UseCounterPageLoadMetricsObserver::GetAllowedUkmFeatures() {
           WebFeature::kBaseWithCrossOriginHref,
           WebFeature::kWakeLockAcquireScreenLock,
           WebFeature::kWakeLockAcquireSystemLock,
+          WebFeature::kThirdPartyServiceWorker,
+          WebFeature::kThirdPartySharedWorker,
+          WebFeature::kThirdPartyBroadcastChannel,
       }));
   return *opt_in_features;
 }