Makes Android 8.1+ translucent Activities to perform as they were bef…

…ore the Android 8 workaround fix (uplift to 1.50.x) (#18039)

Uplift of #18029 (squashed) to release

android/brave_java_resources.gni

@@ -971,6 +971,7 @@ brave_java_resources = [
   "java/res/values-sw600dp/brave_dimens.xml",
   "java/res/values-v21/brave_styles.xml",
   "java/res/values-v26/brave_styles.xml",
+  "java/res/values-v27/brave_styles.xml",
   "java/res/values/array.xml",
   "java/res/values/brave_attrs.xml",
   "java/res/values/brave_colors.xml",

android/java/res/values-v27/brave_styles.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2023 The Brave Authors. All rights reserved.
+     This Source Code Form is subject to the terms of the Mozilla Public
+     License, v. 2.0. If a copy of the MPL was not distributed with this file,
+     You can obtain one at https://mozilla.org/MPL/2.0/.
+-->
+
+<resources>
+    <style name="BraveTranslucent" parent="Theme.AppCompat.Light.NoActionBar">
+        <item name="android:windowIsTranslucent">true</item>
+        <item name="android:windowBackground">@color/translucent_activity_background_color</item>
+        <item name="android:windowContentOverlay">@null</item>
+        <item name="android:windowNoTitle">true</item>
+        <item name="android:backgroundDimEnabled">false</item>
+    </style>
+
+    <style name="BraveTranslucentMaterial" parent="Theme.MaterialComponents.Light.NoActionBar">
+        <item name="android:windowIsTranslucent">true</item>
+        <item name="android:windowBackground">@color/translucent_activity_background_color</item>
+        <item name="android:windowContentOverlay">@null</item>
+        <item name="android:windowNoTitle">true</item>
+        <item name="android:backgroundDimEnabled">false</item>
+    </style>
+</resources>