Add layout/OWNERS file.
Add layout/OWNERS file.

This CL copies the rendering/OWNERS file to layout/OWNERS.

BUG=450612
TBR=jchaffraix@chromium.org

Review URL: https://codereview.chromium.org/870893002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@188867 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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