Implemented Dark Mode on Autofill UI.

Test: manual verification using modified sample app
Test: atest CtsAutoFillServiceTestCases # to make sure it didn't break anything

Bug: 116457731
Fixes: 116180485

Change-Id: I0b7d5415e6b5b8874e27289bee4c8218d63dba13
diff --git a/services/core/java/com/android/server/UiModeManagerInternal.java b/services/core/java/com/android/server/UiModeManagerInternal.java
new file mode 100644
index 0000000..ef29069
--- /dev/null
+++ b/services/core/java/com/android/server/UiModeManagerInternal.java
@@ -0,0 +1,27 @@
+/*
+ * 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.server;
+
+/**
+ * UiModeManager local system service interface.
+ *
+ * @hide Only for use within the system server.
+ */
+public abstract class UiModeManagerInternal {
+
+    public abstract boolean isNightMode();
+}