Add Tint to list of Monorail projects

Change-Id: I370f023c7c4a5e5b1d1c1322bc443c7c375e1089
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2792341
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Auto-Submit: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>

my_activity.py

@@ -122,6 +122,7 @@ monorail_projects = {
     'short_url_protocol': 'https',
   },
   'skia': {},
+  'tint': {},
   'v8': {
     'shorturl': 'crbug.com/v8',
     'short_url_protocol': 'https',