Add stip@ and tonyg@ to chromium.perf failure notifications.
Add stip@ and tonyg@ to chromium.perf failure notifications.

BUG=286625

Review URL: https://codereview.chromium.org/180303002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@253327 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build