IMS-VT: Conf: Propagate call extras to UI.

Call extras of a conference call are not getting
propagating to UI because the ImsConference class
doesn't listen to the onCallExtras notifcations
of the original connection.

Bug: 27105172

Change-Id: I6f5499e3b18f9de87869cb5c9a0191cd59a70f89
diff --git a/src/com/android/services/telephony/ImsConference.java b/src/com/android/services/telephony/ImsConference.java
index 7556798..97cafec 100644
--- a/src/com/android/services/telephony/ImsConference.java
+++ b/src/com/android/services/telephony/ImsConference.java
@@ -19,6 +19,7 @@
 import android.content.Context;
 import android.graphics.drawable.Icon;
 import android.net.Uri;
+import android.os.Bundle;
 import android.telecom.Conference;
 import android.telecom.ConferenceParticipant;
 import android.telecom.Connection.VideoProvider;
@@ -182,6 +183,12 @@
             Log.v(this, "onStatusHintsChanged");
             updateStatusHints();
         }
+
+        @Override
+        public void onExtrasChanged(Connection c, Bundle extras) {
+            Log.v(this, "onExtrasChanged: c=" + c + " Extras=" + extras);
+            setExtras(extras);
+        }
     };
 
     /**