Update owners MockingOomAdjusterTests

This adds the performance team as an owner for the mocking test.
This test can be updated when the CachedAppOptimizer is updated.

Flag: EXEMPT owners-update
Bug: 377479218
Test: presubmit OWNERS verification

Change-Id: Ia6b39048c84412f132998568e4557096aa5a77b6

services/tests/mockingservicestests/src/com/android/server/am/OWNERS

diff --git a/services/tests/mockingservicestests/src/com/android/server/am/OWNERS b/services/tests/mockingservicestests/src/com/android/server/am/OWNERS
index 809b7bb..3edb353 100644
--- a/services/tests/mockingservicestests/src/com/android/server/am/OWNERS
+++ b/services/tests/mockingservicestests/src/com/android/server/am/OWNERS
@@ -3,3 +3,4 @@
 per-file ApplicationStartInfoTest.java = yforta@google.com, carmenjackson@google.com, jji@google.com
 per-file CachedAppOptimizerTest.java = file:/PERFORMANCE_OWNERS
 per-file BaseBroadcastQueueTest.java = file:/BROADCASTS_OWNERS
+per-file MockingOomAdjusterTests.java = file:/PERFORMANCE_OWNERS