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/ParcelableConference.java b/telecomm/java/android/telecom/ParcelableConference.java
index f5689d8..a6221d4 100644
--- a/telecomm/java/android/telecom/ParcelableConference.java
+++ b/telecomm/java/android/telecom/ParcelableConference.java
@@ -41,6 +41,7 @@
     private final int mVideoState;
     private StatusHints mStatusHints;
     private Bundle mExtras;
+    private long mConnectElapsedTimeMillis = Conference.CONNECT_TIME_NOT_SPECIFIED;
 
     public ParcelableConference(
             PhoneAccountHandle phoneAccount,
@@ -51,6 +52,7 @@
             IVideoProvider videoProvider,
             int videoState,
             long connectTimeMillis,
+            long connectElapsedTimeMillis,
             StatusHints statusHints,
             Bundle extras) {
         mPhoneAccount = phoneAccount;
@@ -58,12 +60,12 @@
         mConnectionCapabilities = connectionCapabilities;
         mConnectionProperties = connectionProperties;
         mConnectionIds = connectionIds;
-        mConnectTimeMillis = Conference.CONNECT_TIME_NOT_SPECIFIED;
         mVideoProvider = videoProvider;
         mVideoState = videoState;
         mConnectTimeMillis = connectTimeMillis;
         mStatusHints = statusHints;
         mExtras = extras;
+        mConnectElapsedTimeMillis = connectElapsedTimeMillis;
     }
 
     @Override
@@ -111,6 +113,11 @@
     public long getConnectTimeMillis() {
         return mConnectTimeMillis;
     }
+
+    public long getConnectElapsedTimeMillis() {
+        return mConnectElapsedTimeMillis;
+    }
+
     public IVideoProvider getVideoProvider() {
         return mVideoProvider;
     }
@@ -144,10 +151,11 @@
             StatusHints statusHints = source.readParcelable(classLoader);
             Bundle extras = source.readBundle(classLoader);
             int properties = source.readInt();
+            long connectElapsedTimeMillis = source.readLong();
 
             return new ParcelableConference(phoneAccount, state, capabilities, properties,
-                    connectionIds, videoCallProvider, videoState, connectTimeMillis, statusHints,
-                    extras);
+                    connectionIds, videoCallProvider, videoState, connectTimeMillis,
+                    connectElapsedTimeMillis, statusHints, extras);
         }
 
         @Override
@@ -176,5 +184,6 @@
         destination.writeParcelable(mStatusHints, 0);
         destination.writeBundle(mExtras);
         destination.writeInt(mConnectionProperties);
+        destination.writeLong(mConnectElapsedTimeMillis);
     }
 }