Remove light theme support for split screen surface.

Test: Split screen backgrounds should be dark with white divider.
Fix: 276584850
Change-Id: I90a0da5660d64498dbc83b8d37c55eeb55dc9f80
diff --git a/libs/WindowManager/Shell/res/color/taskbar_background.xml b/libs/WindowManager/Shell/res/color/taskbar_background.xml
deleted file mode 100644
index 876ee02..0000000
--- a/libs/WindowManager/Shell/res/color/taskbar_background.xml
+++ /dev/null
@@ -1,20 +0,0 @@
-<?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.
-  -->
-<!-- Should be the same as in packages/apps/Launcher3/res/color-v31/taskbar_background.xml -->
-<selector xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:color="@android:color/system_neutral1_500" android:lStar="98" />
-</selector>
\ No newline at end of file
diff --git a/libs/WindowManager/Shell/res/color-night/taskbar_background.xml b/libs/WindowManager/Shell/res/color/taskbar_background_dark.xml
similarity index 100%
rename from libs/WindowManager/Shell/res/color-night/taskbar_background.xml
rename to libs/WindowManager/Shell/res/color/taskbar_background_dark.xml
diff --git a/libs/WindowManager/Shell/res/values-night/colors.xml b/libs/WindowManager/Shell/res/values-night/colors.xml
index 5c6bb57..83c4d93 100644
--- a/libs/WindowManager/Shell/res/values-night/colors.xml
+++ b/libs/WindowManager/Shell/res/values-night/colors.xml
@@ -15,7 +15,6 @@
   -->
 
 <resources>
-    <color name="docked_divider_handle">#ffffff</color>
     <!-- Bubbles -->
     <color name="bubbles_icon_tint">@color/GM2_grey_200</color>
     <!-- Splash screen-->
diff --git a/libs/WindowManager/Shell/res/values/colors.xml b/libs/WindowManager/Shell/res/values/colors.xml
index c487e4a..54a8f33 100644
--- a/libs/WindowManager/Shell/res/values/colors.xml
+++ b/libs/WindowManager/Shell/res/values/colors.xml
@@ -17,8 +17,8 @@
  */
 -->
 <resources>
-    <color name="docked_divider_handle">#000000</color>
-    <color name="split_divider_background">@color/taskbar_background</color>
+    <color name="docked_divider_handle">#ffffff</color>
+    <color name="split_divider_background">@color/taskbar_background_dark</color>
     <drawable name="forced_resizable_background">#59000000</drawable>
     <color name="minimize_dock_shadow_start">#60000000</color>
     <color name="minimize_dock_shadow_end">#00000000</color>
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/draganddrop/DropZoneView.java b/libs/WindowManager/Shell/src/com/android/wm/shell/draganddrop/DropZoneView.java
index 28f59b5..724a130 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/draganddrop/DropZoneView.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/draganddrop/DropZoneView.java
@@ -104,7 +104,7 @@
         setContainerMargin(0, 0, 0, 0); // make sure it's populated
 
         mCornerRadius = ScreenDecorationsUtils.getWindowCornerRadius(context);
-        mMarginColor = getResources().getColor(R.color.taskbar_background);
+        mMarginColor = getResources().getColor(R.color.taskbar_background_dark);
         int c = getResources().getColor(android.R.color.system_accent1_500);
         mHighlightColor =  Color.argb(HIGHLIGHT_ALPHA, Color.red(c), Color.green(c), Color.blue(c));
         mSplashScreenColor = Color.argb(SPLASHSCREEN_ALPHA, 0, 0, 0);
@@ -125,7 +125,7 @@
 
     public void onThemeChange() {
         mCornerRadius = ScreenDecorationsUtils.getWindowCornerRadius(getContext());
-        mMarginColor = getResources().getColor(R.color.taskbar_background);
+        mMarginColor = getResources().getColor(R.color.taskbar_background_dark);
         mHighlightColor = getResources().getColor(android.R.color.system_accent1_500);
 
         if (mMarginPercent > 0) {