Add jessemckenna@ to base/task/thread_pool and base/win watchlists

Change-Id: Ib19a8f3fb9430adb03e9b7fe16ffa20a15626369
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2556983Reviewed-by: David Bienvenu <davidbienvenu@chromium.org>
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Cr-Commit-Position: refs/heads/master@{#830603}

WATCHLISTS

@@ -2186,8 +2186,10 @@
     'base_scheduler': ['scheduler-bugs+base@chromium.org'],
     'base_thread_pool': ['fdoray+watch@chromium.org',
                          'gab+watch@chromium.org',
+                         'jessemckenna+watch@google.com',
                          'robliao+watch@chromium.org'],
     'base_win': ['grt+watch@chromium.org',
+                 'jessemckenna+watch@google.com',
                  'robliao+watch@chromium.org',
                  'wfh+watch@chromium.org'],
     'battery_status': ['timvolodine@chromium.org'],