Handle volume benchmark timeout

If a volume benchmark operation times out, we don't want to show
a cryptic toast message. Instead, we return a very large integer
[eg Long.MAX_INT]. The storage wizard can then use this value
to show an appropriate dialog if it chooses.

Bug: 21376364
Change-Id: I3d97336e19c93511cfff2cbdb2f07ab033a1143d
3 files changed