Adjust animation scale range.

The animation scale options are _developer_ options for a reason: They
allow _developers_ to assess and debug animations in the apps the're
developing. A max scale of 2 is not sufficient for that purpose, so
increase the scale.

Change-Id: I68cc5f2f73006ca7696f3950e5e57a38c6341065
(cherry picked from commit eab267cacafa085abc72b81f216bbd5b715cd00f)