DO NOT MERGE more subtle list loading screen

Waiting 2000ms is overmuch. In ideal network conditions, we often beat
this time handily, so let's use the 500ms option instead (with the
simpler, less visually taxing UI).

Bug: 12421412
Change-Id: I2cc1cefb568669a1d8051288118977c8c76d27ac
(cherry picked from commit cae19b8ce580cd33bcd8e3174bb2e3aa70a83e06)
3 files changed