Add watchlist for chrome/browser/metrics/perf/

BUG=b:142130923

Change-Id: I2401c97b6e00b849a41c6cfe71007d7ab31fe3a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1842119
Reviewed-by: Gabriel Marin <[email protected]>
Reviewed-by: George Burgess <[email protected]>
Commit-Queue: Gabriel Marin <[email protected]>
Cr-Commit-Position: refs/heads/master@{#702958}
diff --git a/WATCHLISTS b/WATCHLISTS
index d33267ff..9c06409d 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -1223,6 +1223,9 @@
                   # Exclude XML files; in particular, histograms.xml.
                   '|tools/metrics/[^.]*([.](?!xml$).*)?$',
     },
+    'metrics_perf': {
+      'filepath': 'chrome/browser/metrics/perf/',
+    },
     'metrics_xml_files': {
       # Subscribe to this to watch for changes to histograms.xml.
       'filepath': 'tools/metrics/.*\.xml$',
@@ -2431,6 +2434,7 @@
     'media_win': ['[email protected]'],
     'message_loop': ['[email protected]'],
     'metrics': ['[email protected]'],
+    'metrics_perf': ['[email protected]'],
     'metrics_xml_files': ['[email protected]',
                           '[email protected]'],
     'midi': ['[email protected]'],