smoother progress bar

Remove hard-coded assets for the swipe-refresh progress bar and use a
new procedurally drawn progress bar that runs at 60fps and reduces
memory footprint and GC significantly. Some colors and sizes are now
configurable now, to boot.

Bug: 9737423
Change-Id: I46d34d4c6c49b9c57fb80ff4cb03bdc99cfe13f4
29 files changed