Add base/profiler/ to watchlist stack_sampling_profiler

Bug: 851163
Change-Id: I25fa3661d755118987dc8de8bc5496874d4578a1
Reviewed-on: https://chromium-review.googlesource.com/1217851Reviewed-by: Mike Wittman <wittman@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590145}

WATCHLISTS

@@ -1456,7 +1456,8 @@
                   '|third_party/hunspell_dictionaries/',
     },
     'stack_sampling_profiler': {
-      'filepath': 'components/metrics/*call_stack_profile*',
+      'filepath': 'components/metrics/*call_stack_profile*'\
+                  '|base/profiler/',
     },
     'startup': {
       'filepath': 'chrome/browser/ui/startup/',