RAPPOR metric for usage of RTCPeerConnection without connecting.

third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 1404 matching lines @@
 }
 
 void RTCPeerConnection::closeInternal() {
   DCHECK(m_signalingState != RTCPeerConnection::SignalingStateClosed);
   m_peerHandler->stop();
   m_closed = true;
 
   changeIceConnectionState(ICEConnectionStateClosed);
   changeIceGatheringState(ICEGatheringStateComplete);
   changeSignalingState(SignalingStateClosed);
+  Document* document = toDocument(getExecutionContext());
+  HostsUsingFeatures::countAnyWorld(
+      *document, HostsUsingFeatures::Feature::RTCPeerConnectionUsed);
 }
 
 void RTCPeerConnection::scheduleDispatchEvent(Event* event) {
   scheduleDispatchEvent(event, nullptr);
 }
 
 void RTCPeerConnection::scheduleDispatchEvent(
     Event* event,
     std::unique_ptr<BoolFunction> setupFunction) {
   m_scheduledEvents.push_back(
@@ skipping 47 matching lines @@
 DEFINE_TRACE(RTCPeerConnection) {
   visitor->trace(m_localStreams);
   visitor->trace(m_remoteStreams);
   visitor->trace(m_dispatchScheduledEventRunner);
   visitor->trace(m_scheduledEvents);
   EventTargetWithInlineData::trace(visitor);
   SuspendableObject::trace(visitor);
 }
 
 }  // namespace blink