Add a failure notifier to the PGO builder.
Add a failure notifier to the PGO builder.

R=scottmg@chromium.org

BUG=309849

Review URL: https://codereview.chromium.org/642743005

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@292509 0039d316-1c4b-4281-b951-d872f2087c98

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