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

content/renderer/media/rtc_peer_connection_handler.h

Index: content/renderer/media/rtc_peer_connection_handler.h
diff --git a/content/renderer/media/rtc_peer_connection_handler.h b/content/renderer/media/rtc_peer_connection_handler.h
index 2a440f1e439040009d5699d5c0d76ec723e45025..11e60864c85122c0ae5e33e1d3a2ef9f3a8aa335 100644
--- a/content/renderer/media/rtc_peer_connection_handler.h
+++ b/content/renderer/media/rtc_peer_connection_handler.h
@@ -218,6 +218,10 @@ class CONTENT_EXPORT RTCPeerConnectionHandler
   // 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_;
 
@@ -227,6 +231,11 @@ class CONTENT_EXPORT RTCPeerConnectionHandler
   scoped_refptr<webrtc::UMAObserver> uma_observer_;
   base::TimeTicks ice_connection_checking_start_;
 
+  // |ice_gathering_current_state_| is the most recent ice gathering
+  // |state from OnIceGatheringChange()
+  webrtc::PeerConnectionInterface::IceGatheringState
+      ice_gathering_current_state_;
+
   DISALLOW_COPY_AND_ASSIGN(RTCPeerConnectionHandler);
 };