increase layout timeout to account for older devices

Grid border test fails on older devices because there is a test
case with 700+ columns and some devices just cannot lay it out
in 2 seconds.
This CL incrases the timout to give them enough time to pass.

Bug: 31904754
Test: Test now consistently passes on API 16
Change-Id: I4d5b82432cc9202344c9e24eb420621c01ed7206
1 file changed