[vpython]: Add pypiwin32

Catapult uses this for win32con

Bug: 869249
Change-Id: I6775ff7834100d2b4a55eee3330369fc15b2f14f
Reviewed-on: https://chromium-review.googlesource.com/1157139Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Commit-Queue: Ryan Tseng <hinoka@chromium.org>

.vpython

@@ -30,3 +30,16 @@ wheel: <
   name: "infra/python/wheels/psutil/${platform}_${py_python}_${py_abi}"
   version: "version:5.2.2"
 >
+
+# Used by:
+#   third_party/catapult
+wheel: <
+  name: "infra/python/wheels/pypiwin32/${vpython_platform}"
+  version: "version:219"
+  match_tag: <
+    platform: "win32"
+  >
+  match_tag: <
+    platform: "win_amd64"
+  >
+>