PY3 migration(blink web tests) - Fix PY3 issues on windows

Added pywin32 wheel.
Fix _winreg.

Currently pywebsocket is not bringing up the server. Will take it up after this.
Bug: 1197679

Change-Id: I667a7e84c39f90f4aa0fc4b542e0a5e4d648f6f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3084017
Commit-Queue: Preethi Mohan <[email protected]>
Reviewed-by: Dirk Pranke <[email protected]>
Cr-Commit-Position: refs/heads/master@{#911789}
diff --git a/.vpython3 b/.vpython3
index 3c47efa..935be0a2 100644
--- a/.vpython3
+++ b/.vpython3
@@ -251,3 +251,16 @@
     platform: "linux_armv7l"
   >
 >
+
+# Used by:
+#   //third_party/blink/tools/blinkpy/web_tests/port/server_process.py
+wheel: <
+  name: "infra/python/wheels/pywin32/${vpython_platform}"
+  version: "version:300"
+  match_tag: <
+    platform: "win32"
+  >
+  match_tag: <
+    platform: "win_amd64"
+  >
+>