diff --git a/core/java/android/content/pm/PackageManager.java b/core/java/android/content/pm/PackageManager.java
index 2d9881a..9d2a8ee 100644
--- a/core/java/android/content/pm/PackageManager.java
+++ b/core/java/android/content/pm/PackageManager.java
@@ -4398,7 +4398,6 @@
      * Windows have title bars and can be moved and resized.
      */
     // If this feature is present, you also need to set
-    // com.android.internal.R.config_freeformWindowManagement to true in your configuration overlay.
     @SdkConstant(SdkConstantType.FEATURE)
     public static final String FEATURE_FREEFORM_WINDOW_MANAGEMENT
             = "android.software.freeform_window_management";
diff --git a/core/java/android/content/res/Resources.java b/core/java/android/content/res/Resources.java
index a720b64..248ef1d 100644
--- a/core/java/android/content/res/Resources.java
+++ b/core/java/android/content/res/Resources.java
@@ -2745,17 +2745,6 @@
                 ar.recycle();
                 Log.i(TAG, "...preloaded " + numberOfEntries + " resources in "
                         + (SystemClock.uptimeMillis() - startTime) + "ms.");
-
-                if (sysRes.getBoolean(
-                        com.android.internal.R.bool.config_freeformWindowManagement)) {
-                    startTime = SystemClock.uptimeMillis();
-                    ar = sysRes.obtainTypedArray(
-                            com.android.internal.R.array.preloaded_freeform_multi_window_drawables);
-                    numberOfEntries = preloadDrawables(sysRes, ar);
-                    ar.recycle();
-                    Log.i(TAG, "...preloaded " + numberOfEntries + " resource in "
-                            + (SystemClock.uptimeMillis() - startTime) + "ms.");
-                }
             }
             sysRes.finishPreloading();
         } catch (RuntimeException e) {
diff --git a/core/java/com/android/internal/policy/BackdropFrameRenderer.java b/core/java/com/android/internal/policy/BackdropFrameRenderer.java
deleted file mode 100644
index c6e8bf7..0000000
--- a/core/java/com/android/internal/policy/BackdropFrameRenderer.java
+++ /dev/null
@@ -1,398 +0,0 @@
-/*
- * Copyright (C) 2015 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
- */
-
-package com.android.internal.policy;
-
-import android.graphics.Insets;
-import android.graphics.RecordingCanvas;
-import android.graphics.Rect;
-import android.graphics.RenderNode;
-import android.graphics.drawable.ColorDrawable;
-import android.graphics.drawable.Drawable;
-import android.os.Looper;
-import android.view.Choreographer;
-import android.view.ThreadedRenderer;
-
-/**
- * The thread which draws a fill in background while the app is resizing in areas where the app
- * content draw is lagging behind the resize operation.
- * It starts with the creation and it ends once someone calls destroy().
- * Any size changes can be passed by a call to setTargetRect will passed to the thread and
- * executed via the Choreographer.
- * @hide
- */
-public class BackdropFrameRenderer extends Thread implements Choreographer.FrameCallback {
-
-    private DecorView mDecorView;
-
-    // This is containing the last requested size by a resize command. Note that this size might
-    // or might not have been applied to the output already.
-    private final Rect mTargetRect = new Rect();
-
-    // The render nodes for the multi threaded renderer.
-    private ThreadedRenderer mRenderer;
-    private RenderNode mFrameAndBackdropNode;
-    private RenderNode mSystemBarBackgroundNode;
-
-    private final Rect mOldTargetRect = new Rect();
-    private final Rect mNewTargetRect = new Rect();
-
-    private Choreographer mChoreographer;
-
-    // Cached size values from the last render for the case that the view hierarchy is gone
-    // during a configuration change.
-    private int mLastContentWidth;
-    private int mLastContentHeight;
-    private int mLastXOffset;
-    private int mLastYOffset;
-
-    // Whether to report when next frame is drawn or not.
-    private boolean mReportNextDraw;
-
-    private Drawable mCaptionBackgroundDrawable;
-    private Drawable mUserCaptionBackgroundDrawable;
-    private Drawable mResizingBackgroundDrawable;
-    private ColorDrawable mStatusBarColor;
-    private ColorDrawable mNavigationBarColor;
-    private boolean mOldFullscreen;
-    private boolean mFullscreen;
-    private final Rect mOldSystemBarInsets = new Rect();
-    private final Rect mSystemBarInsets = new Rect();
-    private final Rect mTmpRect = new Rect();
-
-    public BackdropFrameRenderer(DecorView decorView, ThreadedRenderer renderer, Rect initialBounds,
-            Drawable resizingBackgroundDrawable, Drawable captionBackgroundDrawable,
-            Drawable userCaptionBackgroundDrawable, int statusBarColor, int navigationBarColor,
-            boolean fullscreen, Insets systemBarInsets) {
-        setName("ResizeFrame");
-
-        mRenderer = renderer;
-        onResourcesLoaded(decorView, resizingBackgroundDrawable, captionBackgroundDrawable,
-                userCaptionBackgroundDrawable, statusBarColor, navigationBarColor);
-
-        // Create a render node for the content and frame backdrop
-        // which can be resized independently from the content.
-        mFrameAndBackdropNode = RenderNode.create("FrameAndBackdropNode", null);
-
-        mRenderer.addRenderNode(mFrameAndBackdropNode, true);
-
-        // Set the initial bounds and draw once so that we do not get a broken frame.
-        mTargetRect.set(initialBounds);
-        mFullscreen = fullscreen;
-        mOldFullscreen = fullscreen;
-        mSystemBarInsets.set(systemBarInsets.toRect());
-        mOldSystemBarInsets.set(systemBarInsets.toRect());
-
-        // Kick off our draw thread.
-        start();
-    }
-
-    void onResourcesLoaded(DecorView decorView, Drawable resizingBackgroundDrawable,
-            Drawable captionBackgroundDrawableDrawable, Drawable userCaptionBackgroundDrawable,
-            int statusBarColor, int navigationBarColor) {
-        synchronized (this) {
-            mDecorView = decorView;
-            mResizingBackgroundDrawable = resizingBackgroundDrawable != null
-                    && resizingBackgroundDrawable.getConstantState() != null
-                    ? resizingBackgroundDrawable.getConstantState().newDrawable()
-                    : null;
-            mCaptionBackgroundDrawable = captionBackgroundDrawableDrawable != null
-                    && captionBackgroundDrawableDrawable.getConstantState() != null
-                    ? captionBackgroundDrawableDrawable.getConstantState().newDrawable()
-                    : null;
-            mUserCaptionBackgroundDrawable = userCaptionBackgroundDrawable != null
-                    && userCaptionBackgroundDrawable.getConstantState() != null
-                    ? userCaptionBackgroundDrawable.getConstantState().newDrawable()
-                    : null;
-            if (mCaptionBackgroundDrawable == null) {
-                mCaptionBackgroundDrawable = mResizingBackgroundDrawable;
-            }
-            if (statusBarColor != 0) {
-                mStatusBarColor = new ColorDrawable(statusBarColor);
-                addSystemBarNodeIfNeeded();
-            } else {
-                mStatusBarColor = null;
-            }
-            if (navigationBarColor != 0) {
-                mNavigationBarColor = new ColorDrawable(navigationBarColor);
-                addSystemBarNodeIfNeeded();
-            } else {
-                mNavigationBarColor = null;
-            }
-        }
-    }
-
-    private void addSystemBarNodeIfNeeded() {
-        if (mSystemBarBackgroundNode != null) {
-            return;
-        }
-        mSystemBarBackgroundNode = RenderNode.create("SystemBarBackgroundNode", null);
-        mRenderer.addRenderNode(mSystemBarBackgroundNode, false);
-    }
-
-    /**
-     * Call this function asynchronously when the window size has been changed or when the insets
-     * have changed or whether window switched between a fullscreen or non-fullscreen layout.
-     * The change will be picked up once per frame and the frame will be re-rendered accordingly.
-     *
-     * @param newTargetBounds The new target bounds.
-     * @param fullscreen Whether the window is currently drawing in fullscreen.
-     * @param systemBarInsets The current visible system insets for the window.
-     */
-    public void setTargetRect(Rect newTargetBounds, boolean fullscreen, Rect systemBarInsets) {
-        synchronized (this) {
-            mFullscreen = fullscreen;
-            mTargetRect.set(newTargetBounds);
-            mSystemBarInsets.set(systemBarInsets);
-            // Notify of a bounds change.
-            pingRenderLocked(false /* drawImmediate */);
-        }
-    }
-
-    /**
-     * The window got replaced due to a configuration change.
-     */
-    public void onConfigurationChange() {
-        synchronized (this) {
-            if (mRenderer != null) {
-                // Enforce a window redraw.
-                mOldTargetRect.set(0, 0, 0, 0);
-                pingRenderLocked(false /* drawImmediate */);
-            }
-        }
-    }
-
-    /**
-     * All resources of the renderer will be released. This function can be called from the
-     * the UI thread as well as the renderer thread.
-     */
-    void releaseRenderer() {
-        synchronized (this) {
-            if (mRenderer != null) {
-                // Invalidate the current content bounds.
-                mRenderer.setContentDrawBounds(0, 0, 0, 0);
-
-                // Remove the render node again
-                // (see comment above - better to do that only once).
-                mRenderer.removeRenderNode(mFrameAndBackdropNode);
-                if (mSystemBarBackgroundNode != null) {
-                    mRenderer.removeRenderNode(mSystemBarBackgroundNode);
-                }
-
-                mRenderer = null;
-
-                // Exit the renderer loop.
-                pingRenderLocked(false /* drawImmediate */);
-            }
-        }
-    }
-
-    @Override
-    public void run() {
-        try {
-            Looper.prepare();
-            synchronized (this) {
-                if (mRenderer == null) {
-                    // This can happen if 'releaseRenderer' is called immediately after 'start'.
-                    return;
-                }
-                mChoreographer = Choreographer.getInstance();
-            }
-            Looper.loop();
-        } finally {
-            releaseRenderer();
-        }
-        synchronized (this) {
-            // Make sure no more messages are being sent.
-            mChoreographer = null;
-            Choreographer.releaseInstance();
-        }
-    }
-
-    /**
-     * The implementation of the FrameCallback.
-     * @param frameTimeNanos The time in nanoseconds when the frame started being rendered,
-     * in the {@link System#nanoTime()} timebase.  Divide this value by {@code 1000000}
-     */
-    @Override
-    public void doFrame(long frameTimeNanos) {
-        synchronized (this) {
-            if (mRenderer == null) {
-                reportDrawIfNeeded();
-                // Tell the looper to stop. We are done.
-                Looper.myLooper().quit();
-                return;
-            }
-            doFrameUncheckedLocked();
-        }
-    }
-
-    private void doFrameUncheckedLocked() {
-        mNewTargetRect.set(mTargetRect);
-        if (!mNewTargetRect.equals(mOldTargetRect)
-                || mOldFullscreen != mFullscreen
-                || !mSystemBarInsets.equals(mOldSystemBarInsets)
-                || mReportNextDraw) {
-            mOldFullscreen = mFullscreen;
-            mOldTargetRect.set(mNewTargetRect);
-            mOldSystemBarInsets.set(mSystemBarInsets);
-            redrawLocked(mNewTargetRect, mFullscreen);
-        }
-    }
-
-    /**
-     * The content is about to be drawn and we got the location of where it will be shown.
-     * If a "redrawLocked" call has already been processed, we will re-issue the call
-     * if the previous call was ignored since the size was unknown.
-     * @param xOffset The x offset where the content is drawn to.
-     * @param yOffset The y offset where the content is drawn to.
-     * @param xSize The width size of the content. This should not be 0.
-     * @param ySize The height of the content.
-     * @return true if a frame should be requested after the content is drawn; false otherwise.
-     */
-    boolean onContentDrawn(int xOffset, int yOffset, int xSize, int ySize) {
-        synchronized (this) {
-            final boolean firstCall = mLastContentWidth == 0;
-            // The current content buffer is drawn here.
-            mLastContentWidth = xSize;
-            mLastContentHeight = ySize;
-            mLastXOffset = xOffset;
-            mLastYOffset = yOffset;
-
-            // Inform the renderer of the content's new bounds
-            mRenderer.setContentDrawBounds(
-                    mLastXOffset,
-                    mLastYOffset,
-                    mLastXOffset + mLastContentWidth,
-                    mLastYOffset + mLastContentHeight);
-
-            // If this was the first call and redrawLocked got already called prior
-            // to us, we should re-issue a redrawLocked now.
-            return firstCall;
-        }
-    }
-
-    void onRequestDraw(boolean reportNextDraw) {
-        synchronized (this) {
-            mReportNextDraw = reportNextDraw;
-            mOldTargetRect.set(0, 0, 0, 0);
-            pingRenderLocked(true /* drawImmediate */);
-        }
-    }
-
-    /**
-     * Redraws the background, the caption and the system inset backgrounds if something changed.
-     *
-     * @param newBounds The window bounds which needs to be drawn.
-     * @param fullscreen Whether the window is currently drawing in fullscreen.
-     */
-    private void redrawLocked(Rect newBounds, boolean fullscreen) {
-
-        // Make sure that the other thread has already prepared the render draw calls for the
-        // content. If any size is 0, we have to wait for it to be drawn first.
-        if (mLastContentWidth == 0 || mLastContentHeight == 0) {
-            return;
-        }
-
-        // Content may not be drawn at the surface origin, so we want to keep the offset when we're
-        // resizing it.
-        final int left = mLastXOffset + newBounds.left;
-        final int top = mLastYOffset + newBounds.top;
-        final int width = newBounds.width();
-        final int height = newBounds.height();
-
-        mFrameAndBackdropNode.setLeftTopRightBottom(left, top, left + width, top + height);
-
-        // Draw the caption and content backdrops in to our render node.
-        RecordingCanvas canvas = mFrameAndBackdropNode.beginRecording(width, height);
-        final Drawable drawable = mUserCaptionBackgroundDrawable != null
-                ? mUserCaptionBackgroundDrawable : mCaptionBackgroundDrawable;
-
-        if (drawable != null) {
-            drawable.setBounds(0, 0, left + width, top);
-            drawable.draw(canvas);
-        }
-
-        // The backdrop: clear everything with the background. Clipping is done elsewhere.
-        if (mResizingBackgroundDrawable != null) {
-            mResizingBackgroundDrawable.setBounds(0, 0, left + width, top + height);
-            mResizingBackgroundDrawable.draw(canvas);
-        }
-        mFrameAndBackdropNode.endRecording();
-
-        drawColorViews(left, top, width, height, fullscreen);
-
-        // We need to render the node explicitly
-        mRenderer.drawRenderNode(mFrameAndBackdropNode);
-
-        reportDrawIfNeeded();
-    }
-
-    private void drawColorViews(int left, int top, int width, int height, boolean fullscreen) {
-        if (mSystemBarBackgroundNode == null) {
-            return;
-        }
-        RecordingCanvas canvas = mSystemBarBackgroundNode.beginRecording(width, height);
-        mSystemBarBackgroundNode.setLeftTopRightBottom(left, top, left + width, top + height);
-        final int topInset = mSystemBarInsets.top;
-        if (mStatusBarColor != null) {
-            mStatusBarColor.setBounds(0, 0, left + width, topInset);
-            mStatusBarColor.draw(canvas);
-        }
-
-        // We only want to draw the navigation bar if our window is currently fullscreen because we
-        // don't want the navigation bar background be moving around when resizing in docked mode.
-        // However, we need it for the transitions into/out of docked mode.
-        if (mNavigationBarColor != null && fullscreen) {
-            DecorView.getNavigationBarRect(width, height, mSystemBarInsets, mTmpRect, 1f);
-            mNavigationBarColor.setBounds(mTmpRect);
-            mNavigationBarColor.draw(canvas);
-        }
-        mSystemBarBackgroundNode.endRecording();
-        mRenderer.drawRenderNode(mSystemBarBackgroundNode);
-    }
-
-    /** Notify view root that a frame has been drawn by us, if it has requested so. */
-    private void reportDrawIfNeeded() {
-        if (mReportNextDraw) {
-            if (mDecorView.isAttachedToWindow()) {
-                mDecorView.getViewRootImpl().reportDrawFinish();
-            }
-            mReportNextDraw = false;
-        }
-    }
-
-    /**
-     * Sends a message to the renderer to wake up and perform the next action which can be
-     * either the next rendering or the self destruction if mRenderer is null.
-     * Note: This call must be synchronized.
-     *
-     * @param drawImmediate if we should draw immediately instead of scheduling a frame
-     */
-    private void pingRenderLocked(boolean drawImmediate) {
-        if (mChoreographer != null && !drawImmediate) {
-            mChoreographer.postFrameCallback(this);
-        } else {
-            doFrameUncheckedLocked();
-        }
-    }
-
-    void setUserCaptionBackgroundDrawable(Drawable userCaptionBackgroundDrawable) {
-        synchronized (this) {
-            mUserCaptionBackgroundDrawable = userCaptionBackgroundDrawable;
-        }
-    }
-}
diff --git a/core/java/com/android/internal/policy/DecorView.java b/core/java/com/android/internal/policy/DecorView.java
index 74c2325..55c6ad1 100644
--- a/core/java/com/android/internal/policy/DecorView.java
+++ b/core/java/com/android/internal/policy/DecorView.java
@@ -57,7 +57,6 @@
 import android.graphics.PixelFormat;
 import android.graphics.RecordingCanvas;
 import android.graphics.Rect;
-import android.graphics.Region;
 import android.graphics.drawable.ColorDrawable;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.InsetDrawable;
@@ -238,11 +237,8 @@
     private Rect mTempRect;
 
     private boolean mWindowResizeCallbacksAdded = false;
-    private Drawable.Callback mLastBackgroundDrawableCb = null;
-    private BackdropFrameRenderer mBackdropFrameRenderer = null;
     private Drawable mOriginalBackgroundDrawable;
     private Drawable mLastOriginalBackgroundDrawable;
-    private Drawable mResizingBackgroundDrawable;
     private BackgroundBlurDrawable mBackgroundBlurDrawable;
     private BackgroundBlurDrawable mLastBackgroundBlurDrawable;
 
@@ -253,8 +249,6 @@
      */
     @Nullable
     private Drawable mPendingWindowBackground;
-    private Drawable mCaptionBackgroundDrawable;
-    private Drawable mUserCaptionBackgroundDrawable;
 
     String mLogTag = TAG;
     private final Rect mFloatingInsets = new Rect();
@@ -329,26 +323,6 @@
     }
 
     @Override
-    public boolean gatherTransparentRegion(Region region) {
-        boolean statusOpaque = gatherTransparentRegion(mStatusColorViewState, region);
-        boolean navOpaque = gatherTransparentRegion(mNavigationColorViewState, region);
-        boolean decorOpaque = super.gatherTransparentRegion(region);
-
-        // combine bools after computation, so each method above always executes
-        return statusOpaque || navOpaque || decorOpaque;
-    }
-
-    boolean gatherTransparentRegion(ColorViewState colorViewState, Region region) {
-        if (colorViewState.view != null && colorViewState.visible && isResizing()) {
-            // If a visible ColorViewState is in a resizing host DecorView, forcibly register its
-            // opaque area, since it's drawn by a different root RenderNode. It would otherwise be
-            // rejected by ViewGroup#gatherTransparentRegion() for the view not being VISIBLE.
-            return colorViewState.view.gatherTransparentRegion(region);
-        }
-        return false; // no opaque area added
-    }
-
-    @Override
     public void onDraw(Canvas c) {
         super.onDraw(c);
 
@@ -977,15 +951,11 @@
                 updateColorViews(null /* insets */, false /* animate */);
             }
             if (drawable != null) {
-                mResizingBackgroundDrawable = enforceNonTranslucentBackground(drawable,
-                        mWindow.isTranslucent() || mWindow.isShowingWallpaper());
-            } else {
-                mResizingBackgroundDrawable = getResizingBackgroundDrawable(
-                        mWindow.mBackgroundDrawable, mWindow.mBackgroundFallbackDrawable,
-                        mWindow.isTranslucent() || mWindow.isShowingWallpaper());
-            }
-            if (mResizingBackgroundDrawable != null) {
-                mResizingBackgroundDrawable.getPadding(mBackgroundPadding);
+                drawable.getPadding(mBackgroundPadding);
+            } else if (mWindow.mBackgroundDrawable != null) {
+                mWindow.mBackgroundDrawable.getPadding(mBackgroundPadding);
+            } else if (mWindow.mBackgroundFallbackDrawable != null) {
+                mWindow.mBackgroundFallbackDrawable.getPadding(mBackgroundPadding);
             } else {
                 mBackgroundPadding.setEmpty();
             }
@@ -1451,7 +1421,7 @@
                 mWindow.getAttributes().flags, force);
         boolean show = state.attributes.isVisible(state.present, color,
                 mWindow.getAttributes().flags, force);
-        boolean showView = show && !isResizing() && size > 0;
+        boolean showView = show && size > 0;
 
         boolean visibilityChanged = false;
         View view = state.view;
@@ -1505,7 +1475,7 @@
         }
         if (visibilityChanged) {
             view.animate().cancel();
-            if (animate && !isResizing()) {
+            if (animate) {
                 if (showView) {
                     if (view.getVisibility() != VISIBLE) {
                         view.setVisibility(VISIBLE);
@@ -1834,10 +1804,6 @@
             // Note that our ViewRootImpl object will not change.
             getViewRootImpl().addWindowCallbacks(this);
             mWindowResizeCallbacksAdded = true;
-        } else if (mBackdropFrameRenderer != null) {
-            // We are resizing and this call happened due to a configuration change. Tell the
-            // renderer about it.
-            mBackdropFrameRenderer.onConfigurationChange();
         }
 
         updateBackgroundBlurRadius();
@@ -1877,8 +1843,6 @@
             st.menu.close();
         }
 
-        releaseThreadedRenderer();
-
         if (mWindowResizeCallbacksAdded) {
             getViewRootImpl().removeWindowCallbacks(this);
             mWindowResizeCallbacksAdded = false;
@@ -2158,14 +2122,6 @@
     }
 
     void onResourcesLoaded(LayoutInflater inflater, int layoutResource) {
-        if (mBackdropFrameRenderer != null) {
-            loadBackgroundDrawablesIfNeeded();
-            mBackdropFrameRenderer.onResourcesLoaded(
-                    this, mResizingBackgroundDrawable, mCaptionBackgroundDrawable,
-                    mUserCaptionBackgroundDrawable, getCurrentColor(mStatusColorViewState),
-                    getCurrentColor(mNavigationColorViewState));
-        }
-
         final View root = inflater.inflate(layoutResource, null);
 
         // Put it below the color views.
@@ -2174,63 +2130,6 @@
         initializeElevation();
     }
 
-    private void loadBackgroundDrawablesIfNeeded() {
-        if (mResizingBackgroundDrawable == null) {
-            mResizingBackgroundDrawable = getResizingBackgroundDrawable(mWindow.mBackgroundDrawable,
-                    mWindow.mBackgroundFallbackDrawable, mWindow.isTranslucent()
-                    || mWindow.isShowingWallpaper());
-            if (mResizingBackgroundDrawable == null) {
-                // We shouldn't really get here as the background fallback should be always
-                // available since it is defaulted by the system.
-                Log.w(mLogTag, "Failed to find background drawable for PhoneWindow=" + mWindow);
-            }
-        }
-        if (mCaptionBackgroundDrawable == null) {
-            mCaptionBackgroundDrawable = getContext().getDrawable(
-                    R.drawable.decor_caption_title_focused);
-        }
-        if (mResizingBackgroundDrawable != null) {
-            mLastBackgroundDrawableCb = mResizingBackgroundDrawable.getCallback();
-            mResizingBackgroundDrawable.setCallback(null);
-        }
-    }
-
-    /**
-     * Returns the color used to fill areas the app has not rendered content to yet when the
-     * user is resizing the window of an activity in multi-window mode.
-     */
-    public static Drawable getResizingBackgroundDrawable(@Nullable Drawable backgroundDrawable,
-            @Nullable Drawable fallbackDrawable, boolean windowTranslucent) {
-        if (backgroundDrawable != null) {
-            return enforceNonTranslucentBackground(backgroundDrawable, windowTranslucent);
-        }
-
-        if (fallbackDrawable != null) {
-            return enforceNonTranslucentBackground(fallbackDrawable, windowTranslucent);
-        }
-        return new ColorDrawable(Color.BLACK);
-    }
-
-    /**
-     * Enforces a drawable to be non-translucent to act as a background if needed, i.e. if the
-     * window is not translucent.
-     */
-    private static Drawable enforceNonTranslucentBackground(Drawable drawable,
-            boolean windowTranslucent) {
-        if (!windowTranslucent && drawable instanceof ColorDrawable) {
-            ColorDrawable colorDrawable = (ColorDrawable) drawable;
-            int color = colorDrawable.getColor();
-            if (Color.alpha(color) != 255) {
-                ColorDrawable copy = (ColorDrawable) colorDrawable.getConstantState().newDrawable()
-                        .mutate();
-                copy.setColor(
-                        Color.argb(255, Color.red(color), Color.green(color), Color.blue(color)));
-                return copy;
-            }
-        }
-        return drawable;
-    }
-
     void clearContentView() {
         for (int i = getChildCount() - 1; i >= 0; i--) {
             View v = getChildAt(i);
@@ -2243,21 +2142,13 @@
 
     @Override
     public void onWindowSizeIsChanging(Rect newBounds, boolean fullscreen, Rect systemInsets,
-            Rect stableInsets) {
-        if (mBackdropFrameRenderer != null) {
-            mBackdropFrameRenderer.setTargetRect(newBounds, fullscreen, systemInsets);
-        }
-    }
+            Rect stableInsets) {}
 
     @Override
     public void onWindowDragResizeStart(Rect initialBounds, boolean fullscreen, Rect systemInsets,
             Rect stableInsets) {
         if (mWindow.isDestroyed()) {
             // If the owner's window is gone, we should not be able to come here anymore.
-            releaseThreadedRenderer();
-            return;
-        }
-        if (mBackdropFrameRenderer != null) {
             return;
         }
         getViewRootImpl().requestInvalidateRootRenderNode();
@@ -2265,28 +2156,23 @@
 
     @Override
     public void onWindowDragResizeEnd() {
-        releaseThreadedRenderer();
         updateColorViews(null /* insets */, false);
         getViewRootImpl().requestInvalidateRootRenderNode();
     }
 
     @Override
     public boolean onContentDrawn(int offsetX, int offsetY, int sizeX, int sizeY) {
-        if (mBackdropFrameRenderer == null) {
-            return false;
-        }
-        return mBackdropFrameRenderer.onContentDrawn(offsetX, offsetY, sizeX, sizeY);
+        return false;
     }
 
     @Override
     public void onRequestDraw(boolean reportNextDraw) {
-        if (mBackdropFrameRenderer != null) {
-            mBackdropFrameRenderer.onRequestDraw(reportNextDraw);
-        } else if (reportNextDraw) {
-            // If render thread is gone, just report immediately.
-            if (isAttachedToWindow()) {
-                getViewRootImpl().reportDrawFinish();
-            }
+        if (!reportNextDraw) {
+            return;
+        }
+        // If render thread is gone, just report immediately.
+        if (isAttachedToWindow()) {
+            getViewRootImpl().reportDrawFinish();
         }
     }
 
@@ -2307,25 +2193,6 @@
                 mLegacyNavigationBarBackgroundPaint);
     }
 
-    /** Release the renderer thread which is usually done when the user stops resizing. */
-    private void releaseThreadedRenderer() {
-        if (mResizingBackgroundDrawable != null && mLastBackgroundDrawableCb != null) {
-            mResizingBackgroundDrawable.setCallback(mLastBackgroundDrawableCb);
-            mLastBackgroundDrawableCb = null;
-        }
-
-        if (mBackdropFrameRenderer != null) {
-            mBackdropFrameRenderer.releaseRenderer();
-            mBackdropFrameRenderer = null;
-            // Bring the shadow back.
-            updateElevation();
-        }
-    }
-
-    private boolean isResizing() {
-        return mBackdropFrameRenderer != null;
-    }
-
     /**
      * The elevation gets set for the first time and the framework needs to be informed that
      * the surface layer gets created with the shadow size in mind.
@@ -2348,7 +2215,7 @@
         final boolean wasAdjustedForStack = mElevationAdjustedForStack;
         // Do not use a shadow when we are in resizing mode (mBackdropFrameRenderer not null)
         // since the shadow is bound to the content size and not the target size.
-        if ((windowingMode == WINDOWING_MODE_FREEFORM) && !isResizing()) {
+        if (windowingMode == WINDOWING_MODE_FREEFORM) {
             elevation = hasWindowFocus() ?
                     DECOR_SHADOW_FOCUSED_HEIGHT_IN_DIP : DECOR_SHADOW_UNFOCUSED_HEIGHT_IN_DIP;
             // Add a maximum shadow height value to the top level view.
@@ -2367,16 +2234,8 @@
 
         // Don't change the elevation if we didn't previously adjust it for the stack it was in
         // or it didn't change.
-        if ((wasAdjustedForStack || mElevationAdjustedForStack)
-                && getElevation() != elevation) {
-            if (!isResizing()) {
-                mWindow.setElevation(elevation);
-            } else {
-                // Just suppress the shadow when resizing, don't adjust surface insets because it'll
-                // cause a flicker when drag resize for freeform window starts. #onContentDrawn()
-                // will compensate the offset when passing to BackdropFrameRenderer.
-                setElevation(elevation);
-            }
+        if ((wasAdjustedForStack || mElevationAdjustedForStack) && getElevation() != elevation) {
+            mWindow.setElevation(elevation);
         }
     }
 
@@ -2390,16 +2249,6 @@
                 getResources().getDisplayMetrics());
     }
 
-    /**
-     * Provide an override of the caption background drawable.
-     */
-    void setUserCaptionBackgroundDrawable(Drawable drawable) {
-        mUserCaptionBackgroundDrawable = drawable;
-        if (mBackdropFrameRenderer != null) {
-            mBackdropFrameRenderer.setUserCaptionBackgroundDrawable(drawable);
-        }
-    }
-
     private static String getTitleSuffix(WindowManager.LayoutParams params) {
         if (params == null) {
             return "";
diff --git a/core/java/com/android/internal/policy/PhoneWindow.java b/core/java/com/android/internal/policy/PhoneWindow.java
index a091e19..2194c89 100644
--- a/core/java/com/android/internal/policy/PhoneWindow.java
+++ b/core/java/com/android/internal/policy/PhoneWindow.java
@@ -4055,7 +4055,8 @@
 
     @Override
     public void setResizingCaptionDrawable(Drawable drawable) {
-        mDecor.setUserCaptionBackgroundDrawable(drawable);
+        // TODO(b/333724879): Deprecate this public API. The new caption in WM shell allows the app
+        // content to draw behind it directly if requested.
     }
 
     @Override
diff --git a/core/res/res/drawable/decor_caption_title.xml b/core/res/res/drawable/decor_caption_title.xml
deleted file mode 100644
index 591605d3..0000000
--- a/core/res/res/drawable/decor_caption_title.xml
+++ /dev/null
@@ -1,21 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2015 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:state_window_focused="true"
-          android:drawable="@drawable/decor_caption_title_focused" />
-    <item android:drawable="@drawable/decor_caption_title_unfocused" />
-</selector>
diff --git a/core/res/res/drawable/decor_caption_title_focused.xml b/core/res/res/drawable/decor_caption_title_focused.xml
deleted file mode 100644
index 7d1c230..0000000
--- a/core/res/res/drawable/decor_caption_title_focused.xml
+++ /dev/null
@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2015 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.
--->
-
-<shape android:shape="rectangle"
-       android:tintMode="multiply"
-       android:tint="#D8D8D8"
-       xmlns:android="http://schemas.android.com/apk/res/android">
-     <!-- Fading the primary color to 85% blackness -->
-     <solid android:color="?android:attr/colorPrimary" />
-</shape>
diff --git a/core/res/res/drawable/decor_caption_title_unfocused.xml b/core/res/res/drawable/decor_caption_title_unfocused.xml
deleted file mode 100644
index 2846d8ca..0000000
--- a/core/res/res/drawable/decor_caption_title_unfocused.xml
+++ /dev/null
@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2015 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.
--->
-
-<shape android:shape="rectangle"
-       android:tintMode="multiply"
-       android:tint="#F2F2F2"
-       xmlns:android="http://schemas.android.com/apk/res/android">
-     <!-- Fading the primary color to 95% blackness -->
-     <solid android:color="?android:attr/colorPrimary"/>
-</shape>
diff --git a/core/res/res/drawable/decor_close_button_dark.xml b/core/res/res/drawable/decor_close_button_dark.xml
deleted file mode 100644
index 950e4fd..0000000
--- a/core/res/res/drawable/decor_close_button_dark.xml
+++ /dev/null
@@ -1,31 +0,0 @@
-<!--
-Copyright (C) 2015 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.
--->
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-        android:width="32.0dp"
-        android:height="32.0dp"
-        android:viewportWidth="32.0"
-        android:viewportHeight="32.0"
-        android:tint="@color/decor_button_dark_color"
-        >
-    <group android:scaleX="0.5"
-            android:scaleY="0.5"
-            android:translateX="8.0"
-            android:translateY="8.0" >
-        <path
-            android:fillColor="@color/white"
-            android:pathData="M6.9,4.0l-2.9,2.9 9.1,9.1 -9.1,9.200001 2.9,2.799999 9.1,-9.1 9.1,9.1 2.9,-2.799999 -9.1,-9.200001 9.1,-9.1 -2.9,-2.9 -9.1,9.2z"/>
-    </group>
-</vector>
diff --git a/core/res/res/drawable/decor_close_button_light.xml b/core/res/res/drawable/decor_close_button_light.xml
deleted file mode 100644
index d75cd25..0000000
--- a/core/res/res/drawable/decor_close_button_light.xml
+++ /dev/null
@@ -1,31 +0,0 @@
-<!--
-Copyright (C) 2015 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.
--->
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-        android:width="32.0dp"
-        android:height="32.0dp"
-        android:viewportWidth="32.0"
-        android:viewportHeight="32.0"
-        android:tint="@color/decor_button_light_color"
-        >
-    <group android:scaleX="0.5"
-            android:scaleY="0.5"
-            android:translateX="8.0"
-            android:translateY="8.0" >
-        <path
-                android:fillColor="@color/white"
-                android:pathData="M6.9,4.0l-2.9,2.9 9.1,9.1 -9.1,9.200001 2.9,2.799999 9.1,-9.1 9.1,9.1 2.9,-2.799999 -9.1,-9.200001 9.1,-9.1 -2.9,-2.9 -9.1,9.2z"/>
-    </group>
-</vector>
diff --git a/core/res/res/drawable/decor_maximize_button_dark.xml b/core/res/res/drawable/decor_maximize_button_dark.xml
deleted file mode 100644
index 619b460..0000000
--- a/core/res/res/drawable/decor_maximize_button_dark.xml
+++ /dev/null
@@ -1,37 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2015 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.
--->
-
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-        android:width="32.0dp"
-        android:height="32.0dp"
-        android:viewportWidth="32.0"
-        android:viewportHeight="32.0"
-        android:tint="@color/decor_button_dark_color"
-        >
-    <group android:scaleX="0.5"
-            android:scaleY="0.5"
-            android:translateX="8.0"
-            android:translateY="8.0" >
-        <path
-            android:fillColor="@color/white"
-            android:pathData="M2.0,4.0l0.0,16.0l28.0,0.0L30.0,4.0L2.0,4.0zM26.0,16.0L6.0,16.0L6.0,8.0l20.0,0.0L26.0,16.0z"/>
-        <path
-            android:fillColor="@color/white"
-            android:pathData="M2.0,24.0l28.0,0.0l0.0,4.0l-28.0,0.0z"/>
-    </group>
-</vector>
-
-
diff --git a/core/res/res/drawable/decor_maximize_button_light.xml b/core/res/res/drawable/decor_maximize_button_light.xml
deleted file mode 100644
index 5b55fd2..0000000
--- a/core/res/res/drawable/decor_maximize_button_light.xml
+++ /dev/null
@@ -1,35 +0,0 @@
-<!--
-Copyright (C) 2015 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.
--->
-
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-        android:width="32.0dp"
-        android:height="32.0dp"
-        android:viewportWidth="32.0"
-        android:viewportHeight="32.0"
-        android:tint="@color/decor_button_light_color"
-        >
-    <group android:scaleX="0.5"
-            android:scaleY="0.5"
-            android:translateX="8.0"
-            android:translateY="8.0" >
-        <path
-            android:fillColor="@color/white"
-            android:pathData="M2.0,4.0l0.0,16.0l28.0,0.0L30.0,4.0L2.0,4.0zM26.0,16.0L6.0,16.0L6.0,8.0l20.0,0.0L26.0,16.0z"/>
-        <path
-            android:fillColor="@color/white"
-            android:pathData="M2.0,24.0l28.0,0.0l0.0,4.0l-28.0,0.0z"/>
-    </group>
-</vector>
diff --git a/core/res/res/layout/decor_caption.xml b/core/res/res/layout/decor_caption.xml
deleted file mode 100644
index 0246736..0000000
--- a/core/res/res/layout/decor_caption.xml
+++ /dev/null
@@ -1,52 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-**
-** Copyright 2015, 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.
-*/
--->
-
-<com.android.internal.widget.DecorCaptionView xmlns:android="http://schemas.android.com/apk/res/android"
-        android:orientation="vertical"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:descendantFocusability="beforeDescendants" >
-    <LinearLayout
-            android:id="@+id/caption"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:gravity="end"
-            android:background="@drawable/decor_caption_title"
-            android:focusable="false"
-            android:descendantFocusability="blocksDescendants" >
-        <Button
-                android:id="@+id/maximize_window"
-                android:layout_width="32dp"
-                android:layout_height="32dp"
-                android:layout_margin="5dp"
-                android:padding="4dp"
-                android:layout_gravity="center_vertical|end"
-                android:contentDescription="@string/maximize_button_text"
-                android:background="@drawable/decor_maximize_button_dark" />
-        <Button
-                android:id="@+id/close_window"
-                android:layout_width="32dp"
-                android:layout_height="32dp"
-                android:layout_margin="5dp"
-                android:padding="4dp"
-                android:layout_gravity="center_vertical|end"
-                android:contentDescription="@string/close_button_text"
-                android:background="@drawable/decor_close_button_dark" />
-    </LinearLayout>
-</com.android.internal.widget.DecorCaptionView>
diff --git a/core/res/res/values/arrays.xml b/core/res/res/values/arrays.xml
index 97e753e..575573c 100644
--- a/core/res/res/values/arrays.xml
+++ b/core/res/res/values/arrays.xml
@@ -136,11 +136,6 @@
        <item>@color/search_url_text_material_light</item>
     </array>
 
-   <array name="preloaded_freeform_multi_window_drawables">
-      <item>@drawable/decor_maximize_button_dark</item>
-      <item>@drawable/decor_maximize_button_light</item>
-   </array>
-
     <!-- Used in LocalePicker -->
     <string-array translatable="false" name="special_locale_codes">
         <!-- http://b/17150708 - ensure that the list of languages says "Arabic"
diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index 1112e65..0706b32 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -4200,13 +4200,6 @@
          automatically try to pair with it when the device exits tablet mode. -->
     <string translatable="false" name="config_packagedKeyboardName"></string>
 
-    <!-- The device supports freeform window management. Windows have title bars and can be moved
-         and resized. If you set this to true, you also need to add
-         PackageManager.FEATURE_FREEFORM_WINDOW_MANAGEMENT feature to your device specification.
-         The duplication is necessary, because this information is used before the features are
-         available to the system.-->
-    <bool name="config_freeformWindowManagement">false</bool>
-
     <!-- If set, this will force all windows to draw the status bar background, including the apps
          that have not requested doing so (via the WindowManager.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS
          flag). -->
diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index a956a43..87141c7 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -5991,8 +5991,6 @@
     <string name="accessibility_system_action_dpad_right_label">Dpad Right</string>
     <!-- Label for Dpad center action [CHAR LIMIT=NONE] -->
     <string name="accessibility_system_action_dpad_center_label">Dpad Center</string>
-    <!-- Accessibility description of caption view -->
-    <string name="accessibility_freeform_caption">Caption bar of <xliff:g id="app_name">%1$s</xliff:g>.</string>
 
     <!-- Text to tell the user that a package has been forced by themselves in the RESTRICTED bucket. [CHAR LIMIT=NONE] -->
     <string name="as_app_forced_to_restricted_bucket">
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 0d2fd1c..bb73934 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -402,7 +402,6 @@
   <java-symbol type="bool" name="config_supportMicNearUltrasound" />
   <java-symbol type="bool" name="config_supportSpeakerNearUltrasound" />
   <java-symbol type="bool" name="config_supportAudioSourceUnprocessed" />
-  <java-symbol type="bool" name="config_freeformWindowManagement" />
   <java-symbol type="bool" name="config_supportsBubble" />
   <java-symbol type="bool" name="config_supportsMultiWindow" />
   <java-symbol type="bool" name="config_supportsSplitScreenMultiWindow" />
@@ -1266,7 +1265,6 @@
   <java-symbol type="array" name="networkAttributes" />
   <java-symbol type="array" name="preloaded_color_state_lists" />
   <java-symbol type="array" name="preloaded_drawables" />
-  <java-symbol type="array" name="preloaded_freeform_multi_window_drawables" />
   <java-symbol type="array" name="sim_colors" />
   <java-symbol type="array" name="special_locale_codes" />
   <java-symbol type="array" name="special_locale_names" />
@@ -2470,16 +2468,6 @@
 
   <!-- From Phone -->
   <java-symbol type="bool" name="config_built_in_sip_phone" />
-  <java-symbol type="id" name="maximize_window" />
-  <java-symbol type="id" name="close_window" />
-  <java-symbol type="layout" name="decor_caption" />
-  <java-symbol type="drawable" name="decor_caption_title_focused" />
-  <java-symbol type="drawable" name="decor_close_button_dark" />
-  <java-symbol type="drawable" name="decor_close_button_light" />
-  <java-symbol type="drawable" name="decor_maximize_button_dark" />
-  <java-symbol type="drawable" name="decor_maximize_button_light" />
-  <java-symbol type="color" name="decor_button_dark_color" />
-  <java-symbol type="color" name="decor_button_light_color" />
   <java-symbol type="array" name="unloggable_phone_numbers" />
 
   <!-- From TelephonyProvider -->
@@ -4470,8 +4458,6 @@
   <java-symbol type="string" name="accessibility_system_action_dpad_right_label" />
   <java-symbol type="string" name="accessibility_system_action_dpad_center_label" />
 
-  <java-symbol type="string" name="accessibility_freeform_caption" />
-
   <!-- For Wide Color Gamut -->
   <java-symbol type="bool" name="config_enableWcgMode" />