Change color of split screen divider to match taskbar color.

Fix: 197361088
Test: manual
Change-Id: If9d968f3f4f16af1cae730189ceafc7798ff8c0f

packages/SystemUI/res/color/docked_divider_background.xml

@@ -0,0 +1,18 @@
+<?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.
+-->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+  <item android:color="@android:color/system_neutral2_500" android:lStar="35" />
+</selector>

packages/SystemUI/res/values/colors.xml

@@ -149,7 +149,6 @@
     <!-- Chosen so fill over background matches single tone -->
     <color name="dark_mode_qs_icon_color_dual_tone_fill">#99000000</color>
 
-    <color name="docked_divider_background">#ff000000</color>
     <color name="docked_divider_handle">#ffffff</color>
     <drawable name="forced_resizable_background">#59000000</drawable>
     <color name="minimize_dock_shadow_start">#60000000</color>