diff --git a/api/current.txt b/api/current.txt
index d70317e04a686..818469fd1a760 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -1395,6 +1395,7 @@ package android {
     field public static final int windowAllowReturnTransitionOverlap = 16843835; // 0x101043b
     field public static final int windowAnimationStyle = 16842926; // 0x10100ae
     field public static final int windowBackground = 16842836; // 0x1010054
+    field public static final int windowBackgroundFallback = 16844035; // 0x1010503
     field public static final int windowClipToOutline = 16843947; // 0x10104ab
     field public static final int windowCloseOnTouchOutside = 16843611; // 0x101035b
     field public static final int windowContentOverlay = 16842841; // 0x1010059
@@ -1420,7 +1421,6 @@ package android {
     field public static final int windowNoTitle = 16842838; // 0x1010056
     field public static final int windowOverscan = 16843727; // 0x10103cf
     field public static final int windowReenterTransition = 16843951; // 0x10104af
-    field public static final int windowResizingBackground = 16844035; // 0x1010503
     field public static final int windowReturnTransition = 16843950; // 0x10104ae
     field public static final int windowSharedElementEnterTransition = 16843833; // 0x1010439
     field public static final int windowSharedElementExitTransition = 16843834; // 0x101043a
diff --git a/api/system-current.txt b/api/system-current.txt
index f44065e5a4eec..b6e78dc4555a1 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -1491,6 +1491,7 @@ package android {
     field public static final int windowAllowReturnTransitionOverlap = 16843835; // 0x101043b
     field public static final int windowAnimationStyle = 16842926; // 0x10100ae
     field public static final int windowBackground = 16842836; // 0x1010054
+    field public static final int windowBackgroundFallback = 16844035; // 0x1010503
     field public static final int windowClipToOutline = 16843947; // 0x10104ab
     field public static final int windowCloseOnTouchOutside = 16843611; // 0x101035b
     field public static final int windowContentOverlay = 16842841; // 0x1010059
@@ -1516,7 +1517,6 @@ package android {
     field public static final int windowNoTitle = 16842838; // 0x1010056
     field public static final int windowOverscan = 16843727; // 0x10103cf
     field public static final int windowReenterTransition = 16843951; // 0x10104af
-    field public static final int windowResizingBackground = 16844035; // 0x1010503
     field public static final int windowReturnTransition = 16843950; // 0x10104ae
     field public static final int windowSharedElementEnterTransition = 16843833; // 0x1010439
     field public static final int windowSharedElementExitTransition = 16843834; // 0x101043a
diff --git a/core/java/com/android/internal/policy/DecorContext.java b/core/java/com/android/internal/policy/DecorContext.java
index aa603c123f8bd..4f17c39ddf813 100644
--- a/core/java/com/android/internal/policy/DecorContext.java
+++ b/core/java/com/android/internal/policy/DecorContext.java
@@ -17,7 +17,6 @@
 package com.android.internal.policy;
 
 import android.content.Context;
-import android.content.res.TypedArray;
 import android.view.ContextThemeWrapper;
 import android.view.WindowManager;
 import android.view.WindowManagerImpl;
@@ -31,7 +30,6 @@ import android.view.WindowManagerImpl;
 class DecorContext extends ContextThemeWrapper {
     private PhoneWindow mPhoneWindow;
     private WindowManager mWindowManager;
-    private TypedArray mWindowStyle;
 
     public DecorContext(Context context) {
         super(context, null);
@@ -54,13 +52,4 @@ class DecorContext extends ContextThemeWrapper {
         }
         return super.getSystemService(name);
     }
-
-    public TypedArray getWindowStyle() {
-        synchronized (this) {
-            if (mWindowStyle == null) {
-                mWindowStyle = obtainStyledAttributes(com.android.internal.R.styleable.Window);
-            }
-            return mWindowStyle;
-        }
-    }
 }
diff --git a/core/java/com/android/internal/policy/PhoneWindow.java b/core/java/com/android/internal/policy/PhoneWindow.java
index 8b81812c45a55..46442110aa108 100644
--- a/core/java/com/android/internal/policy/PhoneWindow.java
+++ b/core/java/com/android/internal/policy/PhoneWindow.java
@@ -31,7 +31,6 @@ import android.animation.Animator;
 import android.animation.ObjectAnimator;
 import android.app.ActivityManagerNative;
 import android.app.SearchManager;
-import android.graphics.drawable.ColorDrawable;
 import android.os.Build;
 import android.os.UserHandle;
 
@@ -5438,20 +5437,7 @@ public class PhoneWindow extends Window implements MenuBuilder.Callback {
      * */
     private Drawable getResizingBackgroundDrawable() {
         final Context context = mDecor.getContext();
-        final TypedArray windowStyle;
-        if (context instanceof DecorContext) {
-            windowStyle = ((DecorContext) context).getWindowStyle();
-        } else {
-            windowStyle = getWindowStyle();
-        }
-        final int resourceId =
-                windowStyle.getResourceId(R.styleable.Window_windowResizingBackground, 0);
-        if (resourceId != 0) {
-            return context.getDrawable(resourceId);
-        }
 
-        // The app didn't set a resizing background color. In this case we try to use the app's
-        // background drawable for the resizing background.
         if (mBackgroundResource != 0) {
             final Drawable drawable = context.getDrawable(mBackgroundResource);
             if (drawable != null) {
@@ -5459,8 +5445,6 @@ public class PhoneWindow extends Window implements MenuBuilder.Callback {
             }
         }
 
-        // The app background drawable isn't currently set. This might be because the app cleared
-        // it. In this case we try to use the app's background fallback drawable.
         if (mBackgroundFallbackResource != 0) {
             final Drawable fallbackDrawable = context.getDrawable(mBackgroundFallbackResource);
             if (fallbackDrawable != null) {
@@ -5468,7 +5452,9 @@ public class PhoneWindow extends Window implements MenuBuilder.Callback {
             }
         }
 
-        return new ColorDrawable(context.getResources().getInteger(
-                com.android.internal.R.integer.config_windowResizingBackgroundColorARGB));
+        // We shouldn't really get here as the background fallback should be always available since
+        // it is defaulted by the system.
+        Log.w(TAG, "Failed to find background drawable for PhoneWindow=" + this);
+        return null;
     }
 }
diff --git a/core/res/res/values/attrs.xml b/core/res/res/values/attrs.xml
index 8e36eb052ee4c..093ea80950b7e 100644
--- a/core/res/res/values/attrs.xml
+++ b/core/res/res/values/attrs.xml
@@ -323,14 +323,10 @@
         <attr name="windowBackground" format="reference" />
         <!-- Drawable to draw selectively within the inset areas when the windowBackground
              has been set to null. This protects against seeing visual garbage in the
-             surface when the app has not drawn any content into this area. -->
+             surface when the app has not drawn any content into this area. One example is
+             when the user is resizing a window of an activity that has
+             {@link android.R.attr#resizeableActivity} set for multi-window mode. -->
         <attr name="windowBackgroundFallback" format="reference" />
-        <!-- Drawable used to fill in areas the app has not rendered content to yet when the user is
-             resizing the window of an activity that has {@link android.R.attr#resizeableActivity}
-             set for multi-window mode. If unset, the system will try to use windowBackground if
-             set, then windowBackgroundFallback if set. Otherwise, the system default resizing
-             background color -->
-        <attr name="windowResizingBackground" format="reference" />
         <!-- Drawable to use as a frame around the window. -->
         <attr name="windowFrame" format="reference" />
         <!-- Flag indicating whether there should be no title on this window. -->
@@ -1850,7 +1846,6 @@ i
     <declare-styleable name="Window">
         <attr name="windowBackground" />
         <attr name="windowBackgroundFallback" />
-        <attr name="windowResizingBackground" />
         <attr name="windowContentOverlay" />
         <attr name="windowFrame" />
         <attr name="windowNoTitle" />
diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index d20b09fdf4b47..23960e381cf68 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -2349,9 +2349,6 @@
          is non-interactive. -->
     <bool name="config_cameraDoubleTapPowerGestureEnabled">true</bool>
 
-    <!-- Default background color to use when resizing a window if the app didn't specify one. -->
-    <integer name="config_windowResizingBackgroundColorARGB">0xFF808080</integer>
-
     <!-- Name of the component to handle network policy notifications. If present,
          disables NetworkPolicyManagerService's presentation of data-usage notifications. -->
     <string translatable="false" name="config_networkPolicyNotificationComponent"></string>
diff --git a/core/res/res/values/public.xml b/core/res/res/values/public.xml
index 839e81b4373a8..c05b585be2984 100644
--- a/core/res/res/values/public.xml
+++ b/core/res/res/values/public.xml
@@ -2677,7 +2677,7 @@
     <public type="attr" name="level" />
     <public type="attr" name="contextPopupMenuStyle" />
     <public type="attr" name="textAppearancePopupMenuHeader" />
-    <public type="attr" name="windowResizingBackground" />
+    <public type="attr" name="windowBackgroundFallback" />
 
     <public type="style" name="Theme.Material.DayNight" />
     <public type="style" name="Theme.Material.DayNight.DarkActionBar" />
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 6f239e63fe676..b70c0b33f28f9 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -2332,7 +2332,5 @@
 
   <java-symbol type="string" name="config_iccHotswapPromptForRestartDialogComponent" />
 
-  <java-symbol type="integer" name="config_windowResizingBackgroundColorARGB" />
-
   <java-symbol type="string" name="config_packagedKeyboardName" />
 </resources>
diff --git a/packages/SystemUI/res/values/styles.xml b/packages/SystemUI/res/values/styles.xml
index 8f634e1952f74..8241ddf6a3782 100644
--- a/packages/SystemUI/res/values/styles.xml
+++ b/packages/SystemUI/res/values/styles.xml
@@ -36,7 +36,6 @@
     <style name="RecentsTheme.Wallpaper">
         <!-- Wallpaper -->
         <item name="android:windowBackground">@color/transparent</item>
-        <item name="android:windowResizingBackground">@color/transparent</item>
         <item name="android:colorBackgroundCacheHint">@null</item>
         <item name="android:windowShowWallpaper">true</item>
     </style>