Report metrics about negotiated ciphers.

talk/app/webrtc/umametrics.h

Index: talk/app/webrtc/umametrics.h
diff --git a/talk/app/webrtc/umametrics.h b/talk/app/webrtc/umametrics.h
index d029a698bdb8726bbc45d14bd013915f936e7ef5..bb9e05230d35cb0cb7dff3de24515625cd30a6f9 100644
--- a/talk/app/webrtc/umametrics.h
+++ b/talk/app/webrtc/umametrics.h
@@ -65,6 +65,12 @@ enum PeerConnectionMetricsName {
   kTimeToConnect,           // In milliseconds.
   kLocalCandidates_IPv4,    // Number of IPv4 local candidates.
   kLocalCandidates_IPv6,    // Number of IPv6 local candidates.
+  kAudioSrtpCipher,         // Name of SRTP cipher used in audio channel.
+  kAudioSslCipher,          // Name of SSL cipher used in audio channel.
+  kVideoSrtpCipher,         // Name of SRTP cipher used in video channel.
+  kVideoSslCipher,          // Name of SSL cipher used in video channel.
+  kDataSrtpCipher,          // Name of SRTP cipher used in data channel.
+  kDataSslCipher,           // Name of SSL cipher used in data channel.
   kPeerConnectionMetricsName_Max
 };