Add dummy performance test

Bug: 145109184
Test: atest --test-mapping src_path:postsubmit
Change-Id: I7db174942247acd20c94afd7763ec73242a5e44b
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 8061cb4..3e32512 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -7,6 +7,14 @@
           "exclude-annotation": "androidx.test.filters.FlakyTest"
         }
       ]
+    },
+    {
+      "name": "SettingsPrefTests",
+      "options": [
+        {
+          "exclude-annotation": "androidx.test.filters.FlakyTest"
+        }
+      ]
     }
   ]
 }