Add Perf trybots on tryserver.chromium.perf master to mb_config.pyl.
Add Perf trybots on tryserver.chromium.perf master to mb_config.pyl.

BUG=535038
NOTRY=true

Review URL: https://codereview.chromium.org/1383913003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#352153}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk