[vpython] Add chrome/browser/policy/test/policy_testserver.py deps

R=bpastene@chromium.org, sergeyberezin@chromium.org

Bug: 800662
Change-Id: I02f1ce0360c53e26a82b3baafaf11e6fdf0bb8a2
Reviewed-on: https://chromium-review.googlesource.com/868455
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Sergey Berezin <sergeyberezin@chromium.org>
Reviewed-by: Benjamin Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#529873}

.vpython

@@ -105,3 +105,18 @@ wheel: <
   name: "infra/python/wheels/coverage/${vpython_platform}"
   version: "version:4.3.4"
 >
+
+# Used by:
+#   chrome/browser/policy/test/policy_testserver.py
+wheel: <
+  name: "infra/python/wheels/protobuf-py2_py3"
+  version: "version:3.2.0"
+>
+wheel: <
+  name: "infra/python/wheels/six-py2_py3"
+  version: "version:1.10.0"
+>
+wheel: <
+  name: "infra/python/wheels/tlslite-py2_py3"
+  version: "version:0.4.9"
+>