Add two UMA counters for IPv4 and IPv6 local candidates gathered in WebRTC PeerConnection.

content/renderer/media/rtc_peer_connection_handler.h

 // 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_RTC_PEER_CONNECTION_HANDLER_H_
 #define CONTENT_RENDERER_MEDIA_RTC_PEER_CONNECTION_HANDLER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 200 matching lines @@
 
   ScopedVector<WebRtcMediaStreamAdapter> local_streams_;
 
   PeerConnectionTracker* peer_connection_tracker_;
 
   MediaStreamTrackMetrics track_metrics_;
 
   // Counter for a UMA stat reported at destruction time.
   int num_data_channels_created_;
 
+  // Counter for number of IPv4 and IPv6 local candidates.
+  int num_local_candidates_ipv4_;
+  int num_local_candidates_ipv6_;
+
   // |native_peer_connection_| is the libjingle native PeerConnection object.
   scoped_refptr<webrtc::PeerConnectionInterface> native_peer_connection_;
 
   typedef std::map<webrtc::MediaStreamInterface*,
       content::RemoteMediaStreamImpl*> RemoteStreamMap;
   RemoteStreamMap remote_streams_;
   scoped_refptr<webrtc::UMAObserver> uma_observer_;
   base::TimeTicks ice_connection_checking_start_;
 
   DISALLOW_COPY_AND_ASSIGN(RTCPeerConnectionHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_RTC_PEER_CONNECTION_HANDLER_H_