[tracing] add oysteine to base/trace_event/OWNERS
[tracing] add oysteine to base/trace_event/OWNERS

Add oysteine to base/trace_event/OWNERS

BUG=

Review URL: https://codereview.chromium.org/1437003009

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#359680}

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