Launch contact detail screen as a new task

This will have the detail screen appear as a separate task in
"recent task" screen.

Bug: 5039625
Change-Id: Id686650e0d6dafa5afaab53312739fe8fee326de
diff --git a/src/com/android/contacts/CallDetailActivity.java b/src/com/android/contacts/CallDetailActivity.java
index 428e2e8..8e58cd9 100644
--- a/src/com/android/contacts/CallDetailActivity.java
+++ b/src/com/android/contacts/CallDetailActivity.java
@@ -408,6 +408,10 @@
 
                 if (contactUri != null) {
                     mainActionIntent = new Intent(Intent.ACTION_VIEW, contactUri);
+                    // This will launch People's detail contact screen, so we probably want to
+                    // treat it as a separate People task.
+                    mainActionIntent.setFlags(
+                            Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
                     mainActionIcon = R.drawable.ic_contacts_holo_dark;
                     mainActionDescription =
                             getString(R.string.description_view_contact, nameOrNumber);