Merge "Remove unnecessary layer assignment on destroy client surface" into main

     * surfaces that's eligible, if the app is already stopped.

     */

    private void destroySurfaces(boolean cleanupOnResume) {

        boolean destroyedSomething = false;

        // Copying to a different list as multiple children can be removed.

        final ArrayList<WindowState> children = new ArrayList<>(mChildren);

        for (int i = children.size() - 1; i >= 0; i--) {

            final WindowState win = children.get(i);

            destroyedSomething |= win.destroySurface(cleanupOnResume, mAppStopped);

        }

        if (destroyedSomething) {

            final DisplayContent dc = getDisplayContent();

            dc.assignWindowLayers(true /*setLayoutNeeded*/);

            updateLetterboxSurfaceIfNeeded(null);

            win.destroySurface(cleanupOnResume, mAppStopped);

        }

    }