Add chrishtr as a Core OWNER
Add chrishtr as a Core OWNER

As discussed on blink-core-owners-discuss

NOTRY=true

Review URL: https://codereview.chromium.org/533873002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@181255 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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