Fix Master: Add settings for scheduling dark theme

Adding a settings page similar to night light for Dark theme. it will allow the user to schedule
dark mode from sunrise to sunset

Test: make -j64 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.display.DarkUIPreferenceControllerTest" && \
make -j64 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.display.darkmode.DarkModeActivationPreferenceControllerTest" && \
make -j64 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.display.darkmode.DarkModeObserverTest" && \
make -j64 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.display.darkmode.DarkModeScheduleSelectorControllerTest"

Fixes: 141567787
Change-Id: Iee5d020ac6ea093be712a4f191d4601c9d4617fa

res/xml/dark_mode_settings.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2019 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.
+-->
+
+<PreferenceScreen
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:settings="http://schemas.android.com/apk/res-auto"
+    android:title="@string/dark_ui_mode"
+    android:key="dark_ui_mode_screen"
+    settings:keywords="@string/keywords_dark_ui_mode">
+
+    <DropDownPreference
+        android:key="dark_ui_auto_mode"
+        android:title="@string/dark_ui_auto_mode_title"
+        android:summary="%s"
+        android:entries="@array/dark_ui_scheduler_preference_titles"
+        android:entryValues="@array/dark_ui_scheduler_preference_titles"
+        settings:controller="com.android.settings.display.darkmode.DarkModeScheduleSelectorController"
+        settings:keywords="@string/keywords_dark_ui_mode"/>
+
+    <com.android.settingslib.widget.LayoutPreference
+        android:key="dark_ui_activated"
+        android:title="@string/dark_ui_title"
+        android:selectable="false"
+        android:layout="@layout/dark_ui_activation_button"
+        settings:allowDividerBelow="true"
+        settings:controller="com.android.settings.display.darkmode.DarkModeActivationPreferenceController"
+        settings:keywords="@string/keywords_dark_ui_mode"/>
+
+    <com.android.settingslib.widget.FooterPreference
+            android:key="dark_ui_footer"
+            android:title="@string/dark_ui_text"
+            android:selectable="false"
+            settings:searchable="false"
+            settings:allowDividerAbove="true"/>
+
+</PreferenceScreen>

res/xml/dark_ui_settings.xml

@@ -21,4 +21,4 @@
     android:key="dark_ui_mode_screen"
     settings:staticPreferenceLocation="append"
     settings:keywords="@string/keywords_dark_ui_mode">
-</PreferenceScreen >
+</PreferenceScreen >

res/xml/display_settings.xml

@@ -31,6 +31,15 @@
         <intent android:action="com.android.intent.action.SHOW_BRIGHTNESS_DIALOG" />
     </com.android.settingslib.RestrictedPreference>
 
+    <com.android.settings.display.darkmode.DarkModePreference
+        android:key="dark_ui_mode"
+        android:title="@string/dark_ui_mode"
+        android:fragment="com.android.settings.display.darkmode.DarkModeSettingsFragment"
+        android:widgetLayout="@null"
+        settings:widgetLayout="@null"
+        settings:controller="com.android.settings.display.DarkUIPreferenceController"
+        settings:searchable="false"/>
+
     <com.android.settings.display.NightDisplayPreference
         android:key="night_display"
         android:title="@string/night_display_title"
@@ -54,13 +63,6 @@
         settings:controller="com.android.settings.display.WallpaperPreferenceController">
     </com.android.settingslib.RestrictedPreference>
 
-
-    <SwitchPreference
-        android:key="dark_ui_mode"
-        android:title="@string/dark_ui_mode"
-        settings:keywords="@string/keywords_dark_ui_mode"
-        settings:controller="com.android.settings.display.DarkUIPreferenceController"/>
-
     <!-- Cross-listed item, if you change this, also change it in power_usage_summary.xml -->
     <com.android.settings.display.TimeoutListPreference
         android:key="screen_timeout"