Draw status bar background in BackgroundFrameRenderer while resizing

To make sure there is always enough contrast between the status bar
icons and the background, we move the drawing for the status bar
background into BackdropFrameRenderer while resizing, so we can
extend the width into the full surface width.

Bug: 24365214
Change-Id: Ifbb10bacf66670c3637f6f6730a8ac47eb1c3939