Add setting/experiment for time only mode for watch type devices.

Bug: 38259902
Test: none
Change-Id: I884f488c8147e6611cbb9556041920cd7f938aab
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index 2f747ec..733f7a1 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -377,6 +377,7 @@
                     Settings.Global.TETHER_SUPPORTED,
                     Settings.Global.TEXT_CLASSIFIER_CONSTANTS,
                     Settings.Global.THEATER_MODE_ON,
+                    Settings.Global.TIME_ONLY_MODE_ENABLED,
                     Settings.Global.TRANSITION_ANIMATION_SCALE,
                     Settings.Global.TRUSTED_SOUND,
                     Settings.Global.TZINFO_UPDATE_CONTENT_URL,