Subzero: initial codereview and OWNERS files, copied from libcxxabi.

OWNERS

+dschuff@chromium.org
+eliben@chromium.org
+jfb@chromium.org
+jvoung@chromium.org
+kschimpf@google.com
+mseaborn@chromium.org
+sehr@chromium.org
+stichnot@chromium.org

codereview.settings

+# This file is used by gcl to get repository specific information.
+CODE_REVIEW_SERVER: codereview.chromium.org
+CC_LIST: native-client-reviews@googlegroups.com
+VIEW_VC: https://gerrit.chromium.org/gerrit/gitweb?p=native_client/pnacl-subzero.git;a=commit;h=
+STATUS: http://nativeclient-status.appspot.com/status
+TRY_ON_UPLOAD: False
+TRYSERVER_PROJECT: nacl
+TRYSERVER_SVN_URL: svn://svn.chromium.org/chrome-try/try-nacl
+PUSH_URL_CONFIG: url.ssh://gerrit.chromium.org.pushinsteadof
+ORIGIN_URL_CONFIG: http://chromium.googlesource.com