ViewOverlayImpl unspecified API

```
public interface ViewOverlayImpl

                    
```
Backward-compatible implementation of android.view.ViewOverlay. TODO(b/144937975): Remove and use the official version from androidx when it's available.

Method Summary

Modifier and Type	Method	Description
`abstract void`	`add(@NonNull() Drawable drawable)`	Adds a Drawable to the overlay.
`abstract void`	`remove(@NonNull() Drawable drawable)`	Removes the specified Drawable from the overlay.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - add
```
 abstract void add(@NonNull() Drawable drawable)
```
    Adds a Drawable to the overlay. The bounds of the drawable should be relative to the host view.Any drawable added to the overlay should be removed when it is no longer needed or no longervisible.
    
    Parameters:
    
    drawable - The Drawable to be added to the overlay.
  - remove
```
 abstract void remove(@NonNull() Drawable drawable)
```
    Removes the specified Drawable from the overlay.
    
    Parameters:
    
    drawable - The Drawable to be removed from the overlay.