Add UMA metrics for ICE regathering reasons.

webrtc/api/peerconnection.cc

 /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 1282 matching lines @@
 void PeerConnection::RegisterUMAObserver(UMAObserver* observer) {
   TRACE_EVENT0("webrtc", "PeerConnection::RegisterUmaObserver");
   uma_observer_ = observer;
 
   if (session_) {
     session_->set_metrics_observer(uma_observer_);
   }
 
   // Send information about IPv4/IPv6 status.
   if (uma_observer_ && port_allocator_) {
+    port_allocator_->SetMetricsObserver(uma_observer_);
     if (port_allocator_->flags() & cricket::PORTALLOCATOR_ENABLE_IPV6) {
       uma_observer_->IncrementEnumCounter(
           kEnumCounterAddressFamily, kPeerConnection_IPv6,
           kPeerConnectionAddressFamilyCounter_Max);
     } else {
       uma_observer_->IncrementEnumCounter(
           kEnumCounterAddressFamily, kPeerConnection_IPv4,
           kPeerConnectionAddressFamilyCounter_Max);
     }
   }
@@ skipping 1029 matching lines @@
 
 bool PeerConnection::StartRtcEventLog_w(rtc::PlatformFile file,
                                         int64_t max_size_bytes) {
   return media_controller_->call_w()->StartEventLog(file, max_size_bytes);
 }
 
 void PeerConnection::StopRtcEventLog_w() {
   media_controller_->call_w()->StopEventLog();
 }
 }  // namespace webrtc