Update watchlist for monitoring toolbar/

Add a new watch definition 'android_toolbar' and a list for
watching chrome/browser/toolbar java package.

Change-Id: I1cc0ffa66d59abe55974f73700a14b62ec21e59b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490963Reviewed-by: Donn Denman <donnd@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819665}

WATCHLISTS

@@ -97,6 +97,9 @@
     'android_tab': {
       'filepath': 'chrome/android/java/src/org/chromium/chrome/browser/Tab'
     },
+    'android_toolbar': {
+      'filepath': 'chrome/android/java/src/org/chromium/chrome/browser/toolbar/'
+    },
     'android_uma_settings': {
       'filepath': 'chrome/android/java/src/org/chromium/chrome/browser/settings/privacy/PrivacyPreferencesManager.java|'\
                   'chrome/android/java/src/org/chromium/chrome/browser/settings/privacy/PrivacyPreferences.java|'\
@@ -2102,6 +2105,7 @@
     'android_studio': ['wnwen+watch@chromium.org',
                        'nyquist+watch@chromium.org'],
     'android_tab': ['dtrainor+watch@chromium.org'],
+    'android_toolbar': ['jinsukkim+watch@chromium.org'],
     'android_uma_settings': ['asvitkine+watch@chromium.org',
                              'gayane+watch@chromium.org'],
     'android_webapk': ['dominickn+watch-webapk@chromium.org',