Add GCE Windows compile bots as a 10% CQ experiment

Add GCE Windows compile bots as a 10% CQ experiment

These are Win2008R2 bots in GCE.  They're in production for Windows Swarm
Deterministic Build builder, and ran several successful builds on the try waterfall.

BUG=303794
Committed: https://crrev.com/126e9b6c2c982e7039755c9a2c47a02b34dc274b
Cr-Commit-Position: refs/heads/master@{#333191}

[hinoka, 2015-06-05 22:55:37]

hinoka@chromium.org changed reviewers:
+ sergeyberezin@chromium.org

[hinoka, 2015-06-05 22:55:38]

ptal :D.

[Sergey Berezin, 2015-06-06 00:46:17]

lgtm

[hinoka, 2015-06-06 00:46:48]

The CQ bit was checked by hinoka@chromium.org

[commit-bot: I haz the power, 2015-06-06 00:47:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1151763014/1

[commit-bot: I haz the power, 2015-06-06 00:58:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-06 00:59:27]

Patchset 1 (id:??) landed as
https://crrev.com/126e9b6c2c982e7039755c9a2c47a02b34dc274b
Cr-Commit-Position: refs/heads/master@{#333191}