Move foreground drawable down from FrameLayout into View

This will allow any View to include foreground drawables. This is
useful for cases where a foreground drawable is a more appropriate
place to put a state list to show focus or touch highlighting.

Also add View#onDrawForeground as a public API hook for drawing
decorations after primary view content and child views such as
scrollbars, foreground drawables and EdgeEffects.

Change-Id: If1e4700af69db6876970f8f4ad5e3eab11b8034c