Track conference start in system elapsed time.

This is important so that Telecom can track the duration of the call,
which is tracked using wall clock time.

Test: Manual, unit test
Bug: 64068300
Change-Id: If642d282cd8134060acf6ffe8d81215c394d800c
diff --git a/telecomm/java/android/telecom/ConnectionService.java b/telecomm/java/android/telecom/ConnectionService.java
index f78e4276..e814d02 100644
--- a/telecomm/java/android/telecom/ConnectionService.java
+++ b/telecomm/java/android/telecom/ConnectionService.java
@@ -1405,6 +1405,7 @@
                         connection.isRingbackRequested(),
                         connection.getAudioModeIsVoip(),
                         connection.getConnectTimeMillis(),
+                        connection.getConnectElapsedTimeMillis(),
                         connection.getStatusHints(),
                         connection.getDisconnectCause(),
                         createIdList(connection.getConferenceables()),
@@ -1822,6 +1823,7 @@
                             null : conference.getVideoProvider().getInterface(),
                     conference.getVideoState(),
                     conference.getConnectTimeMillis(),
+                    conference.getConnectElapsedTime(),
                     conference.getStatusHints(),
                     conference.getExtras());
 
@@ -1887,6 +1889,7 @@
                     connection.isRingbackRequested(),
                     connection.getAudioModeIsVoip(),
                     connection.getConnectTimeMillis(),
+                    connection.getConnectElapsedTimeMillis(),
                     connection.getStatusHints(),
                     connection.getDisconnectCause(),
                     emptyList,