Promote layout debugging code from GridLayout to ViewGroup.

Layout debugging code draws rectangles around:

1. Layout insets (red)
2. Bounds (blue)
3. Margins (magenta)

Layout debug mode is enabled with:

adb shell setprop debug.layout true

Change-Id: Ia155a2d0fbf33693a1e3c040f627ea3a534e1aff
4 files changed