Add cclao@ and timvp@ to watch for vulkan CLs

This CL adds cclao@ and timvp@ to watch for vulkan CLs so they can be
notified for reviews.

Bug: None
Change-Id: Iea55a95aa2037ae5c141665dfa494c809a5befa2
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2152946
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Tim Van Patten <timvp@google.com>

WATCHLISTS

@@ -19,6 +19,8 @@
   # Please keep alphabetical
   ##############################################################################
   'WATCHLISTS': {
-    'vulkan': ['jmadill+watch@chromium.org'],
+    'vulkan': ['cclao+angleWatchVk@google.com,
+                jmadill+watch@chromium.org,
+                timvp+angleWatchVk@google.com'],
   },
 }