Log the dtls handshake error.

content/renderer/media/rtc_peer_connection_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/rtc_peer_connection_handler.h"
 
 #include <string.h>
 
 #include <string>
 #include <utility>
@@ skipping 692 matching lines @@
                                   counter_max);
         break;
       case webrtc::kEnumCounterIceCandidatePairTypeUdp:
         UMA_HISTOGRAM_ENUMERATION("WebRTC.PeerConnection.CandidatePairType_UDP",
                                   counter, counter_max);
         break;
       case webrtc::kEnumCounterIceCandidatePairTypeTcp:
         UMA_HISTOGRAM_ENUMERATION("WebRTC.PeerConnection.CandidatePairType_TCP",
                                   counter, counter_max);
         break;
+      case webrtc::kEnumCounterDtlsHandshakeError:
+        UMA_HISTOGRAM_ENUMERATION("WebRTC.PeerConnection.DtlsHandshakeError",
+                                  counter, counter_max);
+        break;
       default:
         // The default clause is expected to reach when new enum types are
         // added.
         break;
     }
   }
 
   void IncrementSparseEnumCounter(
       webrtc::PeerConnectionEnumCounterType counter_type,
       int counter) override {
@@ skipping 1179 matching lines @@
 }
 
 void RTCPeerConnectionHandler::ResetUMAStats() {
   DCHECK(thread_checker_.CalledOnValidThread());
   num_local_candidates_ipv6_ = 0;
   num_local_candidates_ipv4_ = 0;
   ice_connection_checking_start_ = base::TimeTicks();
   memset(ice_state_seen_, 0, sizeof(ice_state_seen_));
 }
 }  // namespace content