Add counting of PCs with private IP addresses exposed

Bug: chromium:718508
Change-Id: I37f166808297c565cbb4b4393a23f7a18ab2862d
Reviewed-on: https://webrtc-review.googlesource.com/88640
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23990}
diff --git a/pc/peerconnection.h b/pc/peerconnection.h
index 33abbc7..0efe8b5 100644
--- a/pc/peerconnection.h
+++ b/pc/peerconnection.h
@@ -67,7 +67,8 @@
     REMOTE_CANDIDATE_ADDED = 0x100,
     ICE_STATE_CONNECTED = 0x200,
     CLOSE_CALLED = 0x400,
-    MAX_VALUE = 0x800,
+    PRIVATE_CANDIDATE_COLLECTED = 0x800,
+    MAX_VALUE = 0x1000,
   };
 
   explicit PeerConnection(PeerConnectionFactory* factory,