Map the new category keys to the corresponding fragment.

- map category night_light to NightDisplaySettings
- map category gestures to GestureSettings

Bug: 79530682
Bug: 79532703
Test: make RunSettingsRoboTests
Change-Id: Idc45957d2515e148226897f58fcc358a8c7f37dd

tests/robotests/src/com/android/settings/gestures/GestureSettingsTest.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.gestures;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settingslib.drawer.CategoryKey;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+public class GestureSettingsTest {
+
+    @Test
+    public void getCategoryKey_isCategoryGestures() {
+        GestureSettings settings = new GestureSettings();
+        assertThat(settings.getCategoryKey()).isEqualTo(CategoryKey.CATEGORY_GESTURES);
+    }
+}