am b2690f3: Merge "Fail silently if a process trys to launch an acitvity for background user" into mnc-dev

* commit 'b2690f3857d207321c8e6dc85a3b529ac52404f2':
  Fail silently if a process trys to launch an acitvity for background user

Author: ogunwale

core/java/android/app/Instrumentation.java

@@ -1810,9 +1810,14 @@ public static void checkStartActivityResult(int res, Object intent) {
                 throw new SecurityException(
                         "Starting under voice control not allowed for: " + intent);
             case ActivityManager.START_NOT_CURRENT_USER_ACTIVITY:
-                throw new SecurityException(
-                        "Not allowed to start background user activity that shouldn't be"
-                        + " displayed for all users.");
+                // Fail silently for this case so we don't break current apps.
+                // TODO(b/22929608): Instead of failing silently or throwing an exception,
+                // we should properly position the activity in the stack (i.e. behind all current
+                // user activity/task) and not change the positioning of stacks.
+                Log.e(TAG,
+                        "Not allowed to start background user activity that shouldn't be displayed"
+                        + " for all users. Failing silently...");
+                break;
             default:
                 throw new AndroidRuntimeException("Unknown error code "
                         + res + " when starting " + intent);