Set appropriate capabilities to TestConference

This allows the "Manage conference" screen to show up correctly
for test conference calls

Bug: 18269622
Change-Id: I8467654a8158c5da8c354057f613f122b22a0ed3
diff --git a/tests/src/com/android/server/telecom/testapps/TestConnectionService.java b/tests/src/com/android/server/telecom/testapps/TestConnectionService.java
index a474213..8a97106 100644
--- a/tests/src/com/android/server/telecom/testapps/TestConnectionService.java
+++ b/tests/src/com/android/server/telecom/testapps/TestConnectionService.java
@@ -77,7 +77,11 @@
 
         public TestConference(Connection a, Connection b) {
             super(null);
-
+            setCapabilities(
+                    PhoneCapabilities.SUPPORT_HOLD |
+                    PhoneCapabilities.HOLD |
+                    PhoneCapabilities.MUTE |
+                    PhoneCapabilities.MANAGE_CONFERENCE);
             addConnection(a);
             addConnection(b);