Bump tablet tester execution timeout

They seem to need longer timeout for now. Hopefully will be temporary.

TBR=bpastene

Bug: 853248
Change-Id: I6665013085631c69e6d78fe1f43f195e12d3295c
Reviewed-on: https://chromium-review.googlesource.com/1171909
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582420}
1 file changed