Update icon badges to match spec

- Size defined as percentage of app icon size
- Width changes when there are 2 or 3 digits (round rect)
- Offset slightly away from the app icon
  - Had to move drawing to BubbleTextView instead of
    FastBitmapDrawable
- Hide badge when dragging and while popup is open
- Tweaks for some color/text parameters

Bug: 35744066
Change-Id: Ibb15ca634abaa0729aea637c904c4c6889a58c7c