OOM intervention: Add OWNERS file

Bug: 776665
Change-Id: I41ea9c3315d53a26fdf450ce34e670896bffb962
Reviewed-on: https://chromium-review.googlesource.com/802848Reviewed-by: Maria Khomenko <mariakhomenko@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521236}

chrome/browser/android/oom_intervention/OWNERS

+bashi@chromium.org
+haraken@chromium.org
+
+# TEAM: memory-dev@chromium.org
+# OS: Android