Add win clang 64 bot to master scheduler.
Add win clang 64 bot to master scheduler.

Follow-up to r291884 :-/

BUG=none
TBR=maruel@chromium.org

Review URL: https://codereview.chromium.org/559703002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@291887 0039d316-1c4b-4281-b951-d872f2087c98

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