[bfcache] Add web_tests to linux-bfcache-rel.

This CL adds web tests to the bfcache fyi builder. Config is copied
from similar bots, simply adding the bfcache flag.

Bug: 976218
Change-Id: Icf9ae1a3576f5c4c68b70a330cd729d4cc52871e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1741808
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Arthur Hemery <ahemery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684771}
3 files changed