CROS: Add 40 GCE bots to tryserver pre-CQ pool.
CROS: Add 40 GCE bots to tryserver pre-CQ pool.

BUG=chromium:440148
TEST=None
TBR=petermayo@chromium.org

Review URL: https://codereview.chromium.org/784113002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@293301 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build