Update preferences to Material Next styling

Styles are forked from SettingsLib to avoid using any private APIs.

Test: Settings root, all apps, and about have new style on S
Bug: 187732263
Fix: 188254205, 188012913
Change-Id: I0ca55eecbc82cfa5d0b8707beb4bb7c82b2aa2b1
diff --git a/res/layout-v31/settings_activity.xml b/res/layout-v31/settings_activity.xml
new file mode 100644
index 0000000..59e14f2
--- /dev/null
+++ b/res/layout-v31/settings_activity.xml
@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2021 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.
+-->
+<androidx.coordinatorlayout.widget.CoordinatorLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/content_parent"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:fitsSystemWindows="true">
+
+    <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/app_bar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="?android:attr/colorPrimary"
+        android:fitsSystemWindows="true"
+        android:outlineAmbientShadowColor="@android:color/transparent"
+        android:outlineSpotShadowColor="@android:color/transparent"
+        android:theme="@style/HomeSettings.CollapsingToolbar">
+
+        <com.google.android.material.appbar.CollapsingToolbarLayout
+            android:id="@+id/collapsing_toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="226dp"
+            android:clipToPadding="false"
+            app:collapsedTitleTextAppearance="@style/HomeSettings.CollapsedToolbarTitle"
+            app:contentScrim="@color/home_settings_header_collapsed"
+            app:expandedTitleMarginEnd="24dp"
+            app:expandedTitleMarginStart="24dp"
+            app:expandedTitleTextAppearance="@style/HomeSettings.ExpandedToolbarTitle"
+            app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"
+            app:maxLines="3"
+            app:scrimAnimationDuration="50"
+            app:scrimVisibleHeightTrigger="174dp"
+            app:statusBarScrim="@null"
+            app:titleCollapseMode="fade"
+            app:toolbarId="@id/action_bar">
+
+            <Toolbar
+                android:id="@+id/action_bar"
+                android:layout_width="match_parent"
+                android:layout_height="?attr/actionBarSize"
+                android:theme="?android:attr/actionBarTheme"
+                android:transitionName="shared_element_view"
+                app:layout_collapseMode="pin" />
+
+        </com.google.android.material.appbar.CollapsingToolbarLayout>
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <FrameLayout
+        android:id="@+id/content_frame"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
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