Add tree notification for Chromium Win 10 builder.
Add tree notification for Chromium Win 10 builder.

BUG=592777

Review URL: https://codereview.chromium.org/1771133002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@299141 0039d316-1c4b-4281-b951-d872f2087c98

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