Merge commit 'c9322db9ad0a56810d4bc4d5131b79ca1b7c4225' into sdk-update

Update to CrOS 15457.0.0

BUG=b/277779682
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I556ea2296a9bb0e8b1599a37de3a8789dc61b9b6
tree: d3d543edc4b0f1377162de7d8ca782192495898b
  1. acct-group/
  2. acct-user/
  3. eclass/
  4. metadata/
  5. profiles/
  6. OWNERS
  7. OWNERS.security
  8. PRESUBMIT.cfg
  9. README.md
README.md

CrOS eclass overlay

This eclass overlay is used for 2 purposes: